Hi
Did You found a solution for that?
I am facing this problem since 1.7.5 and now with 1.7.6.4 i can still not translate anything.
Theme and module translations are saved and there is an entry in the ps_translations table. But the Frontend stays the same. I changed the translation manual in all translation folders i could find the string. In the frontend are still different translations, i dont know where the source is from the translations but there seem to be another one. I have switched off all caches too.
The email translations doesn't even save the changes. The green notice "succecfull saved" but the new translation is cleared after saving and change back to the old string
I have installed a new 1.7.6.5 today and still there is the same problem. It is impossible to translate other than in the source code.
I can provide logins if someone who does not have the problem like to have a look into it