Test

1. Login as admin.
2. Open the Messaging drawer.
3. Expand any of the categories (for instance, Starred).
4. Confirm the icons are correctly displayed like the following:
   

Test RTL

1. Login as admin.
2. Install an RTL language pack and enable it
3. Open the Messaging drawer.
4. Expand any of the categories (for instance, Starred).
5. Confirm the icons are correctly displayed like the following:
   

Code verified against automated checks.

Checked MDL-83390 using repository: https://github.com/roland04/moodle.git

• MOODLE_405_STABLE (0 errors / 0 warnings) [branch: MDL-83390-405 | CI Job]
• main (0 errors / 0 warnings) [branch: MDL-83390-main | CI Job]

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