My Favorites languages as far as beauty goes,

1) Castillan Spanish
2) Tuscan Italian
3) Athenian Greek

Some Sub-Saharan African languages also have pleasant acoustical quality to them as do most certainly Brazilian Portuguese and Argentine Spanish dialects.

Now compare from this site how different language groups say 'I love you'

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Germanic languages (W. and N. Europe,etc)
Alsacien - Ich hoan dich gear (E.France)
Afrikaans - Ek het jou lief (South African Republic)
Bavarian - I mog di narrisch gern (south Germany)
Danish - Jeg elsker dig
Dutch - Ik hou van je (Holland)
English - I love you
Flemish - Ik zie oe geerne (north Belgium, like Dutch)
Friesian - Ik hou fan dei (north Holland)
German - Ich liebe dich (sounds more like 'I will kill you')
Icelandic - Eg elska pig
Norwegian - Eg elskar deg (Nynorsk)
Swedish - Jag alskar dig
Swiss-German - Ch'ha di ga"rn (distant from German)
Yiddish - Ikh hob dikh lib (spoken by German Jews)
Vlaams - Ik hue van ye (north Belgium, like Dutch)

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Celtic language (west Europe)
Gaelic - Mo ghradh thu
Gaelic - Ta gra agam ort
Irish - Taim i'ngra leat
Welsh - Rwy'n dy garu di
Welsh - Yr wyf i yn dy garu di (Chwi)

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Basque (N.Spain, SW. France)
Basc - Nere Maitea

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Romance (the nicest sounding of all groups)
Alentejano (Portugal) - Gosto De Ti, Porra!
Catalan - T'estimo (catalonian) (NE Spain)
Corsican - Ti tengu cara (to female)
French - Je t'aime
Italian - Ti amo
Latin - Ego Te amo (ancestor of Romance languages)
Portuguese - Eu te amo
Romanian - Te iubesc (some slavic influence in sound)
Spanish - Te amo (I love you)
-(Madrid lingo - Me molas, tronca)

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Greek language (oldest living language)
Greek - S'agapo
Greek - Ego philo su (ego is only needed for emphasis)

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Albanian language (obscure origin)
Albanian - Te dua

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Slavic (east Europe)
Bulgarian - Obicham te
Croatian - LJUBim te (liubim te)
Czech - Miluji te
Polish - Ja Ciebie Kocham
Russian - Ya tebya loobyoo
Serbocroatian - Volim te
Slovak - lubim ta
Slovene - Ljubim te

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Baltic languages (east Europe)
Latvian - Es tevi Mlu (s teh-vih me-lu)
Lithuanian - Tave myliu (ta-ve mee-lyu) Luo - Aheri

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Armenian language (influenced by Iranic)
Armenian - Yes kez si'rumem
Armenian - Sirem zk 'ez

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Finno-Ugric group (natives in east Europe)
Estonian - Mina armastan sind
Estonian - Ma armastan sind
Finnish - Minä rakastan sinua
Hungarian - Szeretlek te'ged

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Turkic group (central continetal Asia)
Turkish - Seni Seviyurum
Uzbek - Man seni sevaman

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Iranic group (W.Asia)
Farsi - Asheghetam (Iran)
Farsi - Tora dust midaram
Farsi (Persian) - Doostat dAram
Kurdish - Asektem (W.Iran, E.Turkey, N.Iraq)
Kurdish - Ez te hezdikhem
Osetian - Aez dae warzyn (N. Caucassus)
Persian - Tora dost daram
Persian - Aseketem

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Indic group (Indian Subcontinent)
Assamese - Moi tomak bhal pau (E.India,Bangladesh)
Bengali - Ami tomAy bhAlobAshi (E.India,Bangladesh)
Bengali - Ami tomake bhalo basi (E.India,Bangladesh)
Gujrati - Hoon tane pyar karoochhoon (NW India)
Hindi - Mai tumse peyar karta hnu
(official language - India)
Hindi (Kannada) - Naanu ninnannu premisuththene (S.)
India (Malayalam) - njan ninne snehiykkunnu
Nepali - Ma timilai maya garchu
Pakistani - Muje se mu habbat hai
Sinhalese - Mama oyata adarei (Sri Lanka)
Tamil - Naan unni kathilikaran (S.India, Sri Lanka)
Telugu - Neenu ninnu pra'mistu'nnanu (Central E. India)
Urdu - Mujge tumae mahabbat hai (Pakistan)

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Mongol/Altaic Group (central continetal Asia)
Korean - Tangshin-i cho-a-yo
Korean - Sarang Heyo
Korean - Tangsinul sarang ha yo
Korean - Nanun tongshinun sarang

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Tibetan
Tibetan - Khyod-la cags-so

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Japanese Language
Japanese - Ai shite imasu
Japanese - Aishiteru
Japanese - Kimi o ai shiteru
Japanese - Watakushi-wa anata-wo ai shimasu

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E.Asian Languages (China & Indochina)
Burmese - Chit pa de
Cambodian - Bon sro lanh oon
Cambodian - Kh_nhaum soro_lahn nhee_ah
Hokkien - Wa ai lu (China's Fujian province)
Lao - Khoi huk chau
Mandarin - Wo ai ni (N. China)
Taiwanese - Ngua ai di or Wa ga ei li
Thai - Ch'an Rak Khun
Thai - Phom Rak Khun
Thai - Pom rak khun
Thai - Charn Ruck Ter
Vietnamese - Toi yeu em
Vietnamese - Anh ye u em (male to female)

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Austranesian languages (SE Asia, Madagascar, Pacific)
Batak - Holong rohangku di ho (N.Sumatra, Indonesia)
Bicol - Namumutan ta ka (E.Philipines)
Cebuano - Gihigugma ko ikaw (S.Philipines)
Indonesian - Saja tjinta padamu
Indonesian - Saja kasih saudari
Indonesian - Saya Cinta Kamu
Indonesian - Saya cinta padamu
Javanese - Kulo tresno
(Java-most populated Indonesian Island)
Malay - Saya cintamu
Malay - Saya sayangmu
Malay (Indonesian) - Aku sayang enkow
Malay (Indonesian) - Sayah Chantikan Awah
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Pacific Languages
Hawaiian - Aloha wau ia oi
Samoan - Ou te alofa outou
Tahitian - Ua Here Vau la Oe

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Semitic/Cushiotic Group (N.Africa, E.Africa, W.Asia)
Amharic - Afekrishalehou (Ethiopia)
Arabic - Ana Behibek (to a female)
Egyptian - Anna bahebek
Ethiopian - Afgreki'
Hebrew - Ani ohev atach (language of the Jews)
Moroccan - Ana moajaba bik
Tunisian - Ha eh bak
Somali - Wankudja'alahai

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Berber group (NW African regions)
Berber - Lakh tirikh

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Nilotic Group (~S.Sudan and vicinity)
Bari ( S. Sudan) - Nan nyanyar do parik (I love you very much)

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Bantu/Niger-Congo group (most of Subsaharan Africa)
Hausa - Ina sonki (Nigeria)
Kiswahili - Nakupenda (E.Africa)
Lingala - Nalingi yo (R.Congo)
Ndebele - Niyakutanda (Zimbabwe, branch of Zulus)
Shona - Ndinokuda (Zimbabwe)
Swahili - Mimi nakupenda (E.Africa)
Swahili - Ninapenda wewe(E.Africa)
Zulu - Ngiyakuthanda (South African Republic)

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Native American Language (distant Mongol/Altaic origin)
Apache - Shi ingolth-a (E.US)
Aztec - Nimitzlaco'tla (central Mexico)
Bolivian Quechua - Qanta munani
Cherokee - Kykeyu (Georgia,US)
Cherokee - Gv-ge-yu-hi (formal)
Cheyenne - Nemehotâtse (West of Missisipi)
Chickasaw Chiholloli (first "i" nasalized) (Alabama,US)
Eskimo - Nagligivaget(N.Canada, Alaska)
Hopi - Nu' umi unangwa'ta
Inuit - Negligevapse (N.Canada, Alaska)
Mingo - Kanuöhkwa'shæ' (E.US native)
Mohawk - Konoronhkwa
Mohawk - Kanbhik
Navaho - Ayor anosh'ni
Ojibwe - Gi zah gin (Minnesota)
Sioux (Lakota) - Techihhila
Zazi - Ezhele hezdege
Zuni - Tom ho' ichema
Indo - European Map
Native N. American Map
Illyria.net - Index
African Language Map
Euroasian Language Map
World Languages Comparison
of  "I Love You"
Austronesian Map
Semitic/Cushitic Map