TASKMAN-22: Improve UI when no tasks

* Display a message when there is no possible dependency (no task in DB)
* Improve translations
TASKMAN-22: Display only project's relative deps

* Add a javascript that display only possible tasks from the same project
Merge branch 'TASKMAN-22' into TASKMAN-5

Conflicts:
	src/main/resources/TaskManager/TaskManagerTranslations.fr.xml
	src/main/resources/TaskManager/TaskManagerTranslations.xml