Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1216704740705275?focus=true
Tech Design URL (if applicable): 

### Description

### Steps to test this PR

_Feature 1_
- [ ]
- [ ]

### UI changes
| Before  | After |
| ------ | ----- |
!(Upload before screenshot)|(Upload after screenshot)|


<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> String-resource-only changes with no logic updates; main review focus
is UI fit for the 19-character omnibar pill and translation accuracy.
> 
> **Overview**
> Updates **returned Smartling translations** for ad-blocking copy
across the default `values` bundle and many locale
`strings-ad-blocking.xml` files.
> 
> The main user-visible shift is **`ad_blocking_omnibar_badge_text`**:
wording moves from YouTube-specific “on” labels to shorter, generic **ad
blocking** status text (e.g. English **“Ad Blocking On”**), with a
**19-character** Smartling limit and an `instruction` attribute so
translators treat it as an address-bar pill for the feature, not a count
of blocked ads.
> 
> Several other strings get small copy edits—mostly **terminal
punctuation**, **`ad_blocking_disabled_popup_description`** reframed as
an anonymous **report** (not explicitly a “breakage” report), and minor
locale tweaks to settings headers and YouTube contingency messages.
> 
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
8822956480979d88780f7c2e3c2fe178bc383c1b. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

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Co-authored-by: smartling <smartling@host-vm>