Update footer id to "gp-footer". See #244
Move project actions outside the template and make if filterable. Fixes #248
First check if key exists inside the $originals_by_key to hide notices when importing new strings. Fixes #250
First pass on fixing the translations set count cache. Also fixes setting strings obsolete when they already are obsolete

props dimadin. See #208
Make methods public static and stop calling the methods of Gettext_Translations statically  in locales.php. See #220
Make GP_UnitTest_Factory_For_Thing::callback a static method. See #220
Make some methods static and stop using method output as input for another method in po.php and mo.php. See #220
Stop using variable as a reference for the function gp_set_globals(). See #220
Make all methods inside BP_Options static. See #220
don't use reference sign for get_translations_for_domain() calls. Also change that function to only create a Translations object when needed. See #220
Fix proper wp_locale for Belarusian