Localisation updates from http://translatewiki.net.
Correct interpolation variables
Map Serbian locales to Potlatch 2 correctly
conforming this branch to upstream/master ; getting rid of extraneous local changes
Merge remote-tracking branch 'upstream/master' into 4730
conforming this branch to upstream/master ; getting rid of extraneous local changes
conforming this branch to upstream/master ; getting rid of extraneous local changes