PS 1.7.1.1 weird translations behaviour

[samo70]

I have fresh installation of Prestashop 1.7.1.1 with default theme Classic. I have 2 languages set in my store by default (czech - cz and slovak - sk language) There are some weird translations problems: 

 

1. THEME TRANSLATIONS - classic theme translations seems to be OK, when I translate something, it appears in frontoffice, and it also remain in translations.

 

This is OK

 

2. MODULE TRANSLATIONS - I modified some string in bankwire module. This string also appeared in frontoffice, it is OK, but when I came back to translations, there is default string, no my translation (but in frontoffice is still my correct translation), when I tried to change it again, it saved correctly, it is correct also in frontoffice, but when I came back to translations again, there is still defaul string :-/ 

 

This is only for your information, translations are working, but they are not saving in BO.

 

3. BACKOFFICE TRANSLATIONS - I tried to modify some backoffice translations, for example navigation menu item. I translated for example string "Catalog", but no changes appeared in backoffice. When I came back to backoffice translations, there is my translated string, but no changes in backoffice :-/ (I always clear cache in administration and also in browser) 

 

Where can I translate it manually on FTP? In which files are these translations? Thankyou

 

[Martin]

app/resources/translations