2 small problems solved

[onurb-taktile]

• French translations : added "Plural-Forms" headers and a missing translation
• There was a bug in the calendar widget month change : when « or » was clicked, the full
  was embedded in itself instead of simply replacing the table.

[nikrou]

Merge in https://github.com/nikrou/eventHandler/commit/44807878cf00d89484b77c08ba347e3bea5af7c7