Allow infinite levels of menus

Thanks @xiaohutai!

Add notification when adding menuitem

Thanks @anketwokings!

Bugfix

Changes:

• Add specific route bindings and add route to MenuEntry (Thanks @GawainLynch )
• Make id more uniquer: Prevent placing new fields in wrong menu (thanks @bobdenotter )
• Make the template a bit more consistent with the rest of Bolt. (thanks @bobdenotter )
• Fix some typos. (thanks @bobdenotter )

Bolt 3.3 compatability, spanish translation and minor fixes

This adds Bolt 3.3 compatability, spanish translation and minor fixes.

Thanks to @larsvansche @ToBe998 @bobdenotter @filisko and @navelpluisje :)

See full list of changes here: 3.2.1...3.2.2

3.2.1

Fixes the following:

• Search matching at position 0: #52, thanks @motia!
• When not setting the field type the fallback failed: #53, thanks @navelpluisje!

3.2.0

Feature release:

• Added fieldtypes for menuitems, they can now have selectfields and checkboxes too!
• Added edit_permissions
• Added french translation
• Added license
• Fix issues with ContentTypes that don't have icons

3.1.1: Merge branch 'master' of https://github.com/navelpluisje/bolt-menu-ed…

…itor

* 'master' of https://github.com/navelpluisje/bolt-menu-editor:
  Update nl.yml

3.1.0

Added german translation

2.2.5: Merge pull request #30 from SahAssar/master

Fix backup location

2.2.4: Merge pull request #26 from C4Grey/patch-1

Remove unnecessary fetching of content records