New menu page 'Add Several'
Model & template for the "add several events" page
Add dedicated JS file for backend-only functions
Put JS methods for event form set-up in backend.js
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Space-around option for hBox/vBox
Destroy existing widget (if necessary) in addDatePicker
Skeleton of event row add/remove mechanism
Add color to the clone/remove buttons
More space between event rows
Category field
Complete form in add-several page
Begin implement post add-several-events action
ValidetNonEmptyString function
Remove useless method
Implement the add-several action
Fix: for some unclear reason, anchor nodes for date picker must have an ID
Update translation
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