As a language-lover, I know the shahadah in a few languages masha Allah.
I bear witness that there is no god but Allah, and I bear witness that Muhammad is the Messenger of Allah. (English for comparison)
Je témoigne qu'il n'y a pas de divinités sinon Allah et je témoigne que Mohammad est le messager d'Allah. (French)
Atestiguo que no hay más dios que Alá y atestiguo que Muhammad es el mensajero de Alá. (Spanish)
Testimonio che non c'è divinità se non Allàh e testimonio che Muhammad è il Messaggero d'Allàh. (Italian)
Declaro que não há outro deus além de Allah e declaro que Muhammad é mensageiro de Allah. (Portuguese)
一人の神様しか他に神はない、ムハンマドは神様の預言者だと宣言します。 (Japanese)
Hitori-no Kami-sama shika hoka-ni kami wa nai, Muhanmado wa Kami-sama no yokensha da to senden shimasu. (Japanese romanji)
I have used the word "Allah" (or the transliteration of Allah) to describe Allah Subhanahu wa Ta'ala in each shahadah, with the exception of Japanese, in which I used Kami-sama (which roughly translates to "The Great One-and-Only God) because this is the word Japanese Muslims commonly use when referring to Allah Subhanahu wa Ta'ala. I hope you have found this informative insha Allah.
:salamext: