Merge pull request #4 from gmuller668/develop2

Attack summary: enhancements
Add locales for fightPreview file and fix some issues with checkstyles
Fix issue when select specific unit in war tab
Optimization of the treatment of the cached players list
Fix issue with unit speed
Add support of fortress in Attack, attack in progress and slow defense tabs
New tab "External Defense". TODO:
- summary tab
- variation of round time (+- 5 mins)
Merge remote-tracking branch 'upstream/develop' into develop2

Conflicts:
	src/modules/model/habitat.jsm
Fixes:
- fight Preview in External defense tab was not working anymore (conflict with the fortress commit)
- slow defense computation was not working for fortresses