ECMS-4821: Incorrect UI of Add/Edit Template Form

Fix description:
* Update tooltip style for Add Permission icon
ECMS-4725: Some incorrect tooltip styles in Node Type Management

Fix description:
* Update tooltip style for some icons when adding a new node type: Add Super Type/Constraints/Default Type/Required Type
* Show mask for Import popup
* Update tooltip style for View icon
ECMS-5159 Incorrect color of Trash icon in Category Tree Management

Fix description:
* Update the color of Trash icon to light gray
ECMS-5726: Activity still displays on Activity Stream after Accessible Media is deleted

Fix description:
- Add the missing RemoveFileActivityAction Listener
Merge commit '29dfdd6097078bfe2f2660c365d610420a11ef66' into HEAD