Added Lexicon for Gravatar setting

Resolves #11815
Update _tree.scss

Resolves #11949
Closes #12058
Restores horizontal scrolling to the Resource tree

Fixes #11949

* upstream/pr/12060:
  Update _tree.scss
Added Lexicon for Gravatar setting

* origin/pr/12059:
  Added Lexicon for Gravatar setting
Updated lexicons from crowdin

Crowdin project: https://crowdin.net/project/modx-revolution
Thanks to all translators and proofreaders for contribution!
Fixed adding new value from single select
Fix issue #12050 - birthdate on 1970/01/01

This fix is proposed by ReSpawN in issue #12050 https://github.com/modxcms/revolution/issues/12050
Fixed birthdate on 1970/01/01 resulting in false

* origin/pr/12073:
  Fix issue #12050 - birthdate on 1970/01/01
Fix double request while Update Plugin Event
Fix of selection bug in MODx.grid.PluginEventAssoc

Find and fix bug when If you click on the grid by right mouse button it actually doesn't select row. So when you try to remove row from this grid it does nothing.
Fix for form Customizations with multiple constraints breaking TVs
Single-Select TVs now retain custom values in the dropdown select options

Fixes #10072

* upstream/pr/12070:
  Fixed adding new value from single select
Fixes issue with Form Customizations containing multiple constraints on TVs

Resolved #8064
Fixes #8384
Closes #8337
Resolves #7002

* upstream/pr/12075:
  Fix for form Customizations with multiple constraints breaking TVs