libgui/src/files-dock-widget.cc: unnecessary translated strings?

[Andreas Weber]

Dear maintainers,

libgui/src/files-dock-widget.cc:82
  _columns_shown_keys.append (tr ("filesdockwidget/showFileSize"));
  _columns_shown_keys.append (tr ("filesdockwidget/showFileType"));
  _columns_shown_keys.append (tr ("filesdockwidget/showLastModified"));
  _columns_shown_keys.append (tr ("filesdockwidget/showHiddenFiles"));
  _columns_shown_keys.append (tr
("filesdockwidget/useAlternatingRowColors"));

As far as I understand the code, these strings are used as keys and not
visible to the user. So is it save to remove the tr ()?

If I look at the translation files only ja_JP.ts translated these
strings, all other leaved them as they are.

Thank you, Andy