"I can't speak _____ but it's a beautiful language" translated into 74 languages

Notes: Greek comprises its own branch on the Indo-European family tree. Modern Greek is listed below.
Speaker: Jerry Reedy (S)

Notes: The many dialects of Arabic have necessitated a Modern Standard Arabic, which is represented above. I'm eager to add any other dialects as well.
Speaker: Osama Hamad (N), Steve Hewitt (S)

Notes: The language spoken by the Basque people of northern Spain and southwestern France is unrelated to any other known language, making it a language isolate. There are six different dialects, so I don't yet have a transcription.
Speaker: Daniel von Brighoff (S)

Notes: The official language of Bangladesh, and also spoken in eastern India around Calcutta.
Speaker: Sharif Khan (N)

Notes: Since independence the official language of Bosnia-Hercegovina is no longer being lumped in with Serbo-Croatian.
Speaker: Maja Marjanovic (N)

Notes: Breton is the only Celtic language surviving on the European mainland, having been brought to northwestern France by Celtic people fleeing the British Isles during the Anglo-Saxon invasions.
Speaker: Steve Hewitt (S)

Notes: Like Russian, Bulgarian is written in the Cyrillic alphabet, but with one unique symbol. It's the second letter of the third word.
Speaker: Emilia Simeonova (N)

Notes: This is the Chinese language spoken in Hong Kong and parts of southern mainland China. While not mutually intelligible when spoken, the Chinese languages share a more or less similar writing system.
Speaker: ? (N), "Hokshi Hoshi" (?)

Notes: This Romance language is spoken up the east coast of Spain and over the Pyrenees into Andorra, where it is the official language, and a little into France.
Speaker: Gemma (S)

Notes: With the dissolution of Yugoslavia, attempts to create a nationally standard language fell off, and Croatian, Serbian, and Bosnian are being recognized as separate, although closely related, languages.
Speaker: Nikki Ruklić (N)

Speaker: Zuzana Tomková (N)

Notes: The transcription needs considerable fine-tuning, as Danish has an intimidatingly complex vowel system.
Speaker: (N)

Notes: There are a large number of Dutch dialects, both within the Netherlands and in the Flanders region of Belgium, where the language is called Flemish. Worldwide, there are creoles and descendents of Dutch throughout the former Dutch trading empire, most notably Afrikaans in South Africa.
Speaker: Mai (N)

Notes: This is a narrow transcription in a Midwest American accent.
Speaker: János McGhie (N)

Notes: Esperanto was created by Dr L. Zamenhof as a second language for everybody to use when travelling or speaking with foreigners. Obviously it never entirely caught on, but there may be as many as 2 million speakers worldwide who keep in touch through clubs, newsletters, websites, and travel. The language was designed to be very easy to learn, with a completely regular grammar and spelling. There is translated and original Esperanto literature, not to mention songs, movies, and every other kind of medium.
Speaker: János McGhie (S)

Notes: A Finno-Ugric language.
Speaker: Colm Doyle (S)

Notes: The Faroe Islands, halfway between Scotland and Iceland, were settled during the Viking Age and the language retains many elements of Old Norse. The islands are now a self-governing protectorate of Denmark.
Speaker: Heri Joensen (N)

Notes: Fiji, at the eastern edge of Melanesia, was the jumping off point for the settlement of Polynesia. Fiji has strong influences from both regions, but the language is predominantly Polynesian in character.
Speaker: Marica (N)

Notes: Filipino is an attempt to establish an ethnically-neutral common language for the Phillipines, a nation with more than 170 languages. Filipino is most strongly based on Tagalog, which was a solid choice in that Tagalog was already the most widely spoken language in the Philippines, but not so solid in the whole "ethnically-neutral" area.
Speaker: Augusto Xaparrarte (N)

Notes: Along with the distantly-related Hungarian, Finnish is one of the very few non-Indo-European languages in Europe.
Speaker: Gitta Hammarberg (N)

Speaker: Marie (N)

Notes: The Kartvelian languages of the Caucasus Mountains don't seem to be related to anything else, or even for that matter to each other.
Speaker: Eka Tchanturia (N)

Notes: Although this is Standard High German, there are a great number of German dialects, in the north shading gradually into Dutch. Although High German is more prestigious than Low German, the terms simply refer to regional elevation: High German up along the Alps, Low German in the plains to the north.
Speaker: János McGhie (S)

Notes: Greek comprises its own branch on the Indo-European family tree. Modern Greek is directly descended from Ancient Greek.
Speaker: Diomedes Koufteros (N)

Notes: Principally spoken in western India.
Speaker: Asha (N)

Notes: Hebrew is not only written right to left, but the vowels are left out. Verbs and adjectives have different endings based on the gender of whom they refer to. Hebrew essentially died out as a spoken language, although religious use continued, until a Jewish homeland was established in Israel and with great effort Hebrew was successfully revived.
Speaker: Nanette Goldman (S), Elizabeth Weintraub (S)

Notes: Hindi is principally located in central India, but it is one of the more widely used languages in the country. In school all Indian students learn Hindi, English, and the local language, of which there are over 200. Urdu, although written with Arabic characters, is mutually intelligible when spoken.
Speaker: (N)

Notes: The Hmong people originate from the mountains between Vietnam and Laos and allied with the U.S. during the Vietnam War. Understandably many have emigrated in the last few decades, but less comprehensibly more of them came to Minneapolis/St Paul than anywhere else in the U.S. Whatever the attraction was, it wasn't the climate. This previously unwritten language now has a regular, Latin-based alphabet that indicates its 9 tones with final consonants.
Speaker: Alun Lor (N), Pang Yang (N)

Notes: This unwritten Papuan language is spoken by about 3000 Hua people who live in around a dozen villages in the remote Eastern Highlands of Papua New Guinea. I think that qualifies it as the most obscure language on this list.
Speaker: John Haiman (S)

Notes: Hungarian is one of the very few languages spoken in Europe that doesn't belong to the Indo-European language family. The Hungarians migrated to their present location from somewhere on the Russian steppes. Some of their relatives went farther north, as Finnish and Estonian are distantly related, while others went east, leaving related languages in Siberia. The Hungarians' name for themselves and their language is 'Magyar', which is not pronounced 'MAG-yar', but rather more like 'MUJ-jur'.
Speaker: John Haiman (N)

Notes: Iceland's history of high literacy rates and low outside contact have produced a language little changed from the 13th century. Modern Icelanders can read their ancient sagas much more easily than, say, English speakers can read The Canterbury Tales.
Speaker: Tómas (N)

Notes: The original Celtic language of Ireland is dampened by English, but roughly a quarter of Ireland and Northern Ireland's population has a decent command of the language. The strongholds are on the west coast. Irish, or Irish Gaelic, exists in a number of substantially different but mutually intelligible dialects. There is also a degree of intelligibility with the related Scottish Gaelic.
Speaker: Justin McCubbin (S)

Notes: Italian is hardly a homogeneous language, as its many varieties developed from dialects of Latin.
Speaker: Sondra Dorsey (S)

Notes: The Japanese employ not one but three separate writing systems in their language. There is the main syllabary, hiragana, which is augmented with kanji symbols adapted from Chinese writing. The last script, katakana, is used for odd jobs like transliterating foreign words.
Speaker: Miho (N), Colleen Laird (S)

Notes: Spoken in Cambodia. Although it is related to Vietnamese, Khmer doesn't have a tonal system and instead has roughly a million vowels. I still need the written version.
Speaker: John Haiman (S)

Notes: Spoken in Rwanda and Zaire.
Speaker: Eric Kagabo (N), Mark Kile (S)

Notes: A linguist named Marc Okrand was hired to create a language for this alien race on Star Trek. There was enough interest among Trek fans that he published a dictionary and grammar. Now there are Klingon clubs, newsletters, and summer camps, and Okrand regularly publishes badly needed new vocabulary items.
Speaker: Mark E. Shoulson (S)

Notes: The ingenious Korean writing system was devised in 1443 CE, seemingly by the reigning king Sejong himself. The basic consonant letters symbolise the position of the mouth, and strokes were added to indicate additional aspects such as aspiration. The letters are then clumped in syllables.
Speaker: "k0dama" (N)

Notes: A French-based creole spoken on the Caribbean island of Martinique.
Speaker: Cecile (N)

Notes: Láadan is a constructed language invented by science fiction author Suzette Haden Elgin. It is interesting linguistically because it aims to eliminate the perceived sexism of Western languages by including particles that allow speakers to unambiguously convey how they feel about every statement.
Speaker: Colm Doyle (S)

Notes: This is the literary language of Ancient Rome and her empire. The sound of actual spoken Latin, from which all Romance languages (French, Spanish, Portuguese, Italian, Romanian, and others) are descended, is a matter of scholarly debate. The translation is idiomatic, literally meaning 'I do not use the Latin language'.
Speaker: János McGhie (S)

Notes: In the 1950s James Cook Brown created this logical language to be completely unambiguous and culturally neutral. Much of the grammar is actually based on predicate calculus. You can read more about it at www.loglan.org/what-is-loglan.html.
Speaker: James Jennings (S)

Notes: Malay, or Bahasa Malaysia, is the official language of the country you'd expect, as well as Singapore and Brunei. It is similar to Bahasa Indonesia (you can guess where that's spoken) but with much more regional variation.
Speaker: Dzirhan (N)

Notes: This is the official language of China and Taiwan, although it is by no means universally used or understood throughout those countries. The written characters have been simplified by the Chinese government and are not all legible to speakers of other Chinese languages. The accent marks in the transcription indicate rising, falling, or dipping tones.
Speaker: JoAnne Shao (N), Max (S)

Notes: Spoken by the native Polynesian people of New Zealand. Nearly all Māori speak English, but heavily use their own tongue for ceremonial purposes. There has been a strong effort to revitalise the language which has received a lot of official support. Many signs are bilingual and you can have a legal case heard in a Māori-speaking court. New Zealand is also officially known by its Māori name: Aotearoa, which means Land of the Long White Cloud.
Speaker: Tuti Aranui (N)

Notes: Sandwiched between Romania and the Ukraine, a now-independent Moldova was historically caught in a tug-of-war between Romania and the Soviet Union. The result for the Moldovan tongue is a Romance language very close to Romanian but with numerous Slavic influences.
Speaker: Boris, Sarah, & Emmanuil (N,S,N)

Notes: I don't yet have the orthography.
Speaker: Katharine Björk Guneratne (S)

Notes: Norwegian and Swedish are close enough to be mutually intelligible, and the two are the only indigenous European languages to make use of tone. Note that r before a consonant produces a retroflex sound. The numerous dialects of Norwegian, and heavy Danish influence, have given rise to a confusing situation in which there are two written versions of Norwegian in official use, Nynorsk and Bokmål.
Speaker: Mikkel Conradi (N)

Notes: One of the major languages of Ethiopia.
Speaker: Naima Mohamed Ibrahim (N)

Notes: The Osage people originally lived in Missouri and Arkansas, but were forcibly resettled in Oklahoma in the 1800s. The language was suppressed and there are no more native speakers left. However the Osage Nation is working hard to revitalize the language, and very recently created a non-Latin alphabet to replace the diacritic-heavy Latin orthography above.
Speaker: Daniel von Brighoff (S)

Notes: This language is called Farsi by its speakers in Iran, and Dari in Afghanistan, but their language academy has said it's just fine for westerners to go with the more long-standing Persian.
Speaker: Sher Auria (N), Steve Hewitt (S)

Notes: Polish is unique among modern Slavic languages for having nasalised vowels, designated by a cedilla.
Speaker: Natalia Wesołowska (N)

Notes: Spoken, of course, in Portugal but also in Brazil. Also notable for its nasalised vowels.
Speaker: Katie Hardy (N), Viviane (N)

Notes: Romanian, and its next-door-neighbour Moldovan, descended from the Latin exported around the Roman Empire (Romania was the province of Dacia), but due to their farflung location they developed rather seperately from the other Romance languages.
Speaker: Alexandru Burst (N)

Notes: I'd always wondered why Russian letters looked so blocky. It turns out that the Cyrillic alphabet was developed from Greek letters by Greek Orthodox missionaries who were creating a written language for the Russians so they could print religious texts. Apparently lower case letters were considered too base for religious printing, so Cyrillic letters were all modelled after the blockier upper case Greek letters.
Speaker: Alina Doroshko (N), Max (N)

Notes: Although the Scottish tribes that so vexed the Romans spoke their own Celtic languages, Scottish Gaelic is descended from the Irish Gaelic introduced by settlers from northeast Ireland in the middle of the first millenium CE. The later invasion of Germanic speakers into Great Britain produced a Germanic language called Scots or Inglis, and only in the 19th C. did the dialect of Scottish English supplant everything before it. Like most other Celtic languages, Scottish Gaelic is struggling to survive, with most speakers on the coast and islands of the northwest. Literally the words translate as "Gaelic is not at me, but it is a beautiful language that is in it."
Speaker: Harry Campbell (S)

Notes: With the dissolution of Yugoslavia, attempts to create a nationally standard language fell off, and Croatian, Serbian, and Bosnian are being recognized as separate, although closely related, languages.
Speaker: "Unchatenfrance" (S)

Notes: A wide variety of Shona dialects are spoken in Zimbabwe and Mozambique. Most dialects are tonal, with vowels having either a low or high tone.
Speaker: (N)

Speaker: Zuzana Tomková (N)

Notes:
Speaker: Ali Ali Ali (N)

Speaker: José Munuera (N)

Notes: Swahili was originally spoken along the coast and islands of East Africa, and absorbed many Arabic words from Arab traders. Swahili spread inland as a lingua franca as the coastal people became the middlemen in an extensive trade network. Consequently Swahili is the most widely spoken Bantu language, and is a second language for most of its speakers. It has official status in Kenya, Tanzania, and recently Uganda, and is spoken in several surrounding East African countries.
Speaker: Bengo Mrema (N), Mark Kile (N)

Notes: Swedish has been more nationally standardised than Norwegian, with which it is mutually intelligible. Together they are the only two indigenous European languages to make use of tone.
Speaker: Karin (N)

Notes: The Tatars are a Turkic people who swept into western Russia and ruled the country from the 13th to the 16th Centuries.
Speaker: (N)

Notes: The Thai writing system was based on Khmer, which was based on Sanskrit.
Speaker: Tissana Kijsanayotin (N)

Notes: There are some 800 languages spoken in Papua New Guinea, so this English-based creole has become a significant means of communication between language groups. It is used extensively in the government and urban areas. Although Tok Pisin is a corruption of Talk Pidgin, the language has advanced beyond a pidgin (a rudimentary "Me Tarzan, you Jane" system) to an independent language with its own rules and irregularities. The simplified phonology can disguise English derivations; the adjective phrase "wanpela gutpela" can be glossed "one-fellow good-fellow". Native English speakers, like my source, have a more Anglicised pronunciation than New Guineans who didn't know English first.
Speaker: Luke Sykora (S)

Notes: A Caucasian language spoken by perhaps 15,000 speakers in the Russian republic of Dagestan. There is a Cyrillic and a Latin-based orthography, but for most Tsez speakers it only an oral language.
Speaker: André Müller (S)

Notes: Turkish is a classic example of an agglutinative language, in which concepts are strung together in one word. Whereas "I can't speak" in English is broken up into several words, Turkish tacks on suffix after suffix. Thus the second word of the phrase can be read as "speak-not-I".
Speaker: Hüseyin Özhan (N)

Notes: Despite being the most widely spoken native language in Ghana, Akan didn't get a name until the 1950s. There are so many distinct dialects, Akan speakers prefer to describe their language by the name of the dialect, such as Twi or Fante. Many of them use letters from the International Phonetic Alphabet in their spelling, which I highly encourage other languages to consider.
Speaker: Kwame Yankson (N)

Notes: Ukrainian is written in the same Cyrillic alphabet as Russian, but the "i" and "ï" letters are unique.
Speaker: Vasil (N)

Notes: Urdu is spoken in Pakistan. Although they're written in very different scripts, the language is closely related to Hindi. Owing to the current hostilities between Pakistan and India, this fact often comes as an enormous shock to speakers of either language.
Speaker: Steve Hewitt (S), Hashaam Sheikh (N)

Notes: One of the few Asian languages written in the Roman alphabet, albeit with some way cool diacritics. The language is usually spoken with six tones, five of which are represented in the phrase.
Speaker: Trung Nguyen (N), Long "bakjak" Nguyen (N) [no relation]

Notes: Although only a quarter of the population of Wales speaks this Celtic language, revitalisation efforts are gaining strength. Wales is renowned for its intimidating place names, such as Betws-y-Coed and Penrhyndeudraeth.
Speaker: Steve Hewitt (S)

Notes: Wolof is the most widely spoken language in Senegal, and is also spoken in the Gambia and Mauritania. A writing system using the Roman alphabet, with diacritics to make the vowels phonemic, was standardised in the 1970s. In Wolof verbs are not conjugated, and instead the pronouns are inflected to indicate person and aspect.
Speaker: Walt Blue (S)