I had a play with the translation using .po files a little while ago and I noticed the following.
In no particular order...
- Not all translations are 100% complete
- You need @T("your text here") around things to be translated
- You need to create your own .po files for your own modules and put the translations you want in there (because sometimes good as google translate is, it gets things wrong!)
So you may need to look into the files yourself and check if there is a translation for the wording you need
Hope that helps