Added requested languages from transifex
Updated translations
Added messages for new languages
Updated .mo
Updated .po from transifex
Updated locale with dummy data so they are picked up by tx push
Used google's workbench to translate 30% of arabic
Manual fixes to arabic django.po
Updated arabic
Updated changelog for version 2.4a22
comment the amharic language
limit the model translation language to english by default. Add the settings for translated languages.
add missing...space
clear map thumbs logic
Merge pull request #1765 from simod/map-cleanup

clear map thumbs logic
changed temporal extent fields to DateTime
fixed temporal extent formatting in the xml template
fixed some pep8 errors reported by flake8
added datetime support for temporal extent fields in layers, maps and documents
Merge branch 'ricardogsilva-fix#1746'