XWIKI-11023: $services.localization.render as alt attribute of icons in the field palette

(cherry picked from commit ab3204d2ee6ed382531aab76a53e65d6e6f2bd4f)
XWIKI-11025: Unable to "Delete all entries" from apps whose names include a special character

quick fix to have at least spaces working

(cherry picked from commit fe0ad2e53a88682caff8c183b2797409ed1f483d)
[cleanup] Updated wiki pages to the new xar format.

(cherry picked from commit a827346b0b3e6c3c12920d3156c3e60e30bbed65)
XWIKI-10296: The default value of a date field should be empty or today, not the date when the class has been created
- Using a magic date to mark inside an application's template that a default value is not actually set and that the emptyIsToday mechanism should still be applied when creating new entries.
- Used a custom displayer for Date fields that displays an empty value in the AWM class editor or the entry's edit/create form when the magic value is set to the template so that the user is never exposed to this technical detail.

(cherry picked from commit 74c35f45de2a6d9efd0f542c945a197cca8410d7)