Update git submodules
- Update extensions/CategoryTree from branch 'REL1_39' to fb505f95f18104bf5fafd65ac8cfc95c677e064e
- Localisation updates from https://translatewiki.net.
Change-Id: I5a0623ec0ecaa45c286a1e451bf8d2cebe38c6e6
- Localisation updates from https://translatewiki.net.