Fixes warning when compiling translated XML

This patch fixes the typical warning when writing XML:

    po/sl/menus/colors/components.po:8: warning: header field 'Language'
    still has the initial default value
Fixes XML compilation error for `sl`

This patches an error and failure compiling XML:

    po/sl/menus/colors/components.po:302: 'msgid' and 'msgstr' entries
    do not both end with '\n'