fix(confirmations): update bonus payout subtitle (MetaMask#26019)

<!--
Please submit this PR as a draft initially.
Do not mark it as "Ready for review" until the template has been
completely filled out, and PR status checks have passed at least once.
-->

## **Description**

Updates the claim bonus subtitle copy to be more concise and
natural-sounding.

**Before:** "Bonus payout will be on {{networkName}} Network."
**After:** "Bonus will be paid out on {{networkName}}."

## **Changelog**

<!--
If this PR is not End-User-Facing and should not show up in the
CHANGELOG, you can choose to either:
1. Write `CHANGELOG entry: null`
2. Label with `no-changelog`

If this PR is End-User-Facing, please write a short User-Facing
description in the past tense like:
`CHANGELOG entry: Added a new tab for users to see their NFTs`
`CHANGELOG entry: Fixed a bug that was causing some NFTs to flicker`

(This helps the Release Engineer do their job more quickly and
accurately)
-->

CHANGELOG entry: Updated mUSD claim bonus subtitle copy

## **Related issues**

Fixes: https://consensyssoftware.atlassian.net/browse/MUSD-312

## **Manual testing steps**

```gherkin
Feature: mUSD Claim Bonus Subtitle

  Scenario: user views claim bonus confirmation screen
    Given user has mUSD tokens with claimable yield rewards
    And user is on the mUSD token details screen

    When user taps the "Claim" button to claim bonus
    Then the confirmation screen displays "Claim bonus" as the title
    And the subtitle shows "Bonus will be paid out on Linea."
```

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<!-- [screenshots/recordings] -->

### **After**
<img width="388" height="565" alt="Screenshot 2026-02-12 at 16 55 22"
src="https://github.com/user-attachments/assets/d4508e6d-7114-4859-a3e0-3d369fe9a8ef"
/>

<!-- [screenshots/recordings] -->

## **Pre-merge author checklist**

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I've included tests if applicable
- [x] I've documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I've applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> String-only localization copy change plus a matching test update; no
logic, security, or data-handling behavior is modified.
> 
> **Overview**
> Updates the `mUSD` claim bonus confirmation subtitle to a shorter,
more natural sentence by changing `earn.claim_bonus_subtitle` from
“Bonus payout will be on {{networkName}} Network.” to “Bonus will be
paid out on {{networkName}}.”
> 
> Adjusts the `Title` component test to assert the new subtitle text for
the Linea Mainnet case.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
428bdaf. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: PatrykLucka

app/components/Views/confirmations/components/title/title.test.tsx

@@ -320,9 +320,7 @@ describe('Confirm Title', () => {
       state: musdClaimState,
     });
     expect(getByText('Claim bonus')).toBeTruthy();
-    expect(
-      getByText('Bonus payout will be on Linea Mainnet Network.'),
-    ).toBeTruthy();
+    expect(getByText('Bonus will be paid out on Linea Mainnet.')).toBeTruthy();
   });
 
   it.each([TransactionType.lendingDeposit, TransactionType.lendingWithdraw])(

locales/languages/en.json

@@ -5796,7 +5796,7 @@
     "earn_a_percentage_bonus": "Earn a {{percentage}}% bonus",
     "claimable_bonus": "Claimable bonus",
     "claim_bonus": "Claim bonus",
-    "claim_bonus_subtitle": "Bonus payout will be on {{networkName}} Network.",
+    "claim_bonus_subtitle": "Bonus will be paid out on {{networkName}}.",
     "empty_state_cta": {
       "heading": "Lend {{tokenSymbol}} and earn",
       "body": "Lend your {{tokenSymbol}} with {{protocol}} and earn",