[TRANSUP] Arabic by Hosham, added new translator

Signed-off-by: Werner Macho <werner.macho@gmail.com>
[FEATURE][composer] Allow for more than one atlas controlled map in compositions (or none), by moving some atlas properties to map items (fix #9248) (fix #6484)
Merge pull request #1072 from nyalldawson/atlas_multimap3

[FEATURE][composer] Allow for more than one atlas controlled map in comp...
expression builder: add splitters and change buttons

respect HIG
Merge pull request #1073 from 3nids/expressiondialogsplitter

expression builder: add splitters and change buttons
CODING

Small typo fix in coding doc
fix warning