fix(synchro): suppress event propag and 100% processGlobal (refs #4401)

Suppress the publication of and postSynchronize event at 100% synchro
fix(synchro): better user message when bad synchro (refs #4401)

Parse return of server and display a beautiful message
fix(i18n): update i18n (refs #4404)
fix(date): correct date format (refs #4403)

Correct the date format when provided date is empty
version(VERSION): update version (refs #4401)
Merge pull request #49 from cbonnissent/1.6.11

VERSION 1.6.11 (closes #4401, closes #4404, closes #4403)