Kupenda is the Swahili verb for "to love." Following is a list of showing " I Love You" in different languages. (from an unknown source)
Afrikaans: Ek is lief vir jou
Albanian: Te dua
Arabic: Ana behibak (to male) or Ana behibek (to female)
Armenian: Yes kez sirumem
Basque: Maitea haut
Bavarian: I mog di narrisch gern
Bengali: Ami tomake bhalobashi
Bulgarian: Obicham te
Burmese: Nin ko nga chitde or Chit pa de
Cambodian: Bon sro lanh oon
Catalan: T'estimo
Cherokee: Tsi ge yu i
Cheyenne: Ne mohotatse
Chichewa: Ndimakukonda
Chickasaw: Chiholloli
Chinese: Ngo oi ney or Wo ai ni
Corsican: Ti tengu caru
Croatian: Volim te
Czech: Miluji te
Danish: Jeg elske dig
Dholuo (Kenyan tribe): Aheri ~ contributed by Evelyn D.
Dutch: Ik hou van je
Elvish: Amin mela lle from The Lord of the Rings by J.R.R. Tolkien
English: I love you
Esperanto: Mi amas vin
Estonian: Mina armastan sind
Ethiopian: Afgreki'
Farsi: Mahn doostaht doh-rahm
Filipino: Mahal kita
Finnish: Mina rakastan sinua
Flemish: Ik zie oe geerne
French: Je t'aime
Gaelic: Ta gra agam ort
Georgian: Mikvarhar
German: Ich liebe dich
Greek: S'agapo
Greenlandic: Asavakit
Gujarati: Mai thara prem karu chu
Haitian Creole: Mwen renmen'w
Hawaiian: Aloha au ia'oe
Hebrew: Ani ohev otah (to female) or Ani ohevet othah (to male)
Hindi: Mai tumase pyar karata hun or Mai tumase pyar karati hun
Hopi: Nu' umi unangwa'ta
Hungarian: Szeretlek
Icelandic: Eg elska thig
Indian Gujarati dialect: Tane prem karoo choo
Indonesian: Saya cinta padamu
Irish: Taim i'ngra leat
Italian: Ti amo or Ti voglio bene
Japanese: Ai shite ru or Kimi o ai shiteru
Kannada (India): Naanu ninnanu preethisuthene
Korean: Sarang hapnida
Kurdish: Ez te hezdikhem
Lao: Khoi huk chau
Latin: Te amo
Latvian: Es tev milu
Lebanese: Bahibak
Lithuanian: As myliu tave
Luo: Aheri
Macedonian: Te sakam
Malay: Saya cintamu or Saya sayangmu
Maltese: Inhobbok
Mandarin: Wo ai ni
Mohawk: Konoronhkwa or Kanbhik
Moroccan: Ana moajaba bik
Navajo: Ayor anosh'ni
Norwegian: Jeg elsker deg or elsker deg
Pakistani: Muje tum se mu habbat hai
Persian: Doostet daram or Tora dost daram
Philippines: Mahal kita ~ contributed by Mai.
Pig Latin: Ie Ovele Ouye
Polish: Kocham cie
Portuguese: Eu te amo
Romanian: Te iubesc ~ contributed by Steve K.
Russian: La liubliu tebia or Ya vas lyublyu
Scottish Gaelic: Tha gra dh agam ort
Serbian: Ljubim te or Ja te volim
Sign language: I
-- point at self with index finger.
love
-- hold crossed hands over your chest.
you
-- point with index finger to the other person.
Sioux: Techihhila
Slovak: Lubim ta
Slovenian: Ljubim te
South African: Ek het jou lief
Spanish: Te amo
Swedish: Jag alskar dig
Swiss: Ch'ha di ga'rn
Syrian: Bhebbek (to female) or Bhebbak (to male)
Tagalog: Iniibig kita or mahal kita
Taiwanese: Gwa ai lee
Tahitian: Ua here vau ia oe
Thai: Phom rak khun or Ch'an rak khun
Tswana: Ke a go rata
Tunisian: Ha eh bak
Turkish: Seni seviyorum
Ukrainian: Ya tebe kahayu
Urdu: Me aap se pyaar karthi houn
Venda: Ndi a ni funa
Vietnamese: Anh yeu em (to female) or Em yeu anh (to male)
Welsh: Rwy'n dy garu di
Wolof (Western Africa, mostly Senegal area): Nop nala
Yiddish: Ikh hob dikh lib
Yugoslavian: Ya te volim
Zulu: Ngiyakuthanda
Zuni: Tom ho'ichema