Is it permissible in translation work to translate ordinary sentences and avoid translating sentences that contain inappropriate language? And is it obligatory to give charity if there were previous translations of simple sentences that contained inappropriate language?

Translation is like writing, so whatever a Muslim is not permitted to write, he is not permitted to translate. If the phrases in question are forbidden, then the questioner has done well by refraining from translating them, and he must seek forgiveness for what he has translated from them, and give charity if possible. This is especially important if the translation fee was calculated based on the number of sentences.