User Query: Don't blindly re-append new meta queries for capabilities.

fixes #21119.

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About page: Translate all Under the Hood strings.

see #27713.

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Update the TinyMCE paste plugin to the latest development version. It includes a fix for pasting from Word: removes inline comments and change tracking.
Changeset: https://github.com/tinymce/tinymce/commit/f8cffdf34287afaa54ffbf7d6b0eb7b22a8c27ac
Fixes #27771
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Add a feature pointer for widgets in the customizer in 3.9. Remove older pointers from 3.3 and 3.4.

see #27777.

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Add an explanation for 'Paste from Word' in the 'Paste from Text' dialog.

fixes #27777. see #27160.

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Translate another About string and use _e(). see #27713.

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The widgets pointer requires the edit_theme_options capability.

(It's hypothetically possible to have only switch_themes.)

see #27777.

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RTL for TinyMCE:
- Add _dir: 'rtl' to the TinyMCE translation object.
- Fix editor.css for RTL.
- Fix the Edit and Delete buttons position for wpview and images.
- For _mce_set_direction(), update documentation and fix adding the 'ltr' button.
Fixes #27773
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