I opened this thread to have a common place for the localization related issues, this way the dev.team can find easier these bugs.

If you find a problem in the language support, please submit here.

When I enable the 'System - K2 (User)' plugin in Plugin Manager and I click the 'Create account' link in the 'K2 Login' module or in the core login module, the labels of the K2 fields (Gender, Description, etc.) remain English.

The same happens when I open the edit screen to modify the details.

On the path /components/com_k2/views/itemlist in files view.feed.php and view.html.php JText cannot replace the following texts because of the extra space appended:

'Displaying items by tag: '
'Search results for: '
'Items filtered by date: '

I found another one in the back-end in file view.html.php on the path /administrator/components/com_k2/views/extrafieldsgroup:

'Add/Edit Extra Field Group '

These strings remain English even after appending the space to the end of the definition of the language file.

The idea is excellent to differ the section titles with blue color in K2 Settings, K2 Tools and K2 Comments, but inconvenient for the language files, because these CSS styled default spacer values won't be translated. After removing the CSS code the strings, e.g. 'Top Commenters' will be translated.