feat: MUSD-352 replace boost with bonus globally for conversion flows (#26453)

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## **Description**
This PR updates copy for the mUSD conversion flow. All occurrences of
`"boost"` have been replaced with `"bonus"`.
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## **Changelog**

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CHANGELOG entry: updated mUSD conversion flow copy to replace boost with
bonus

## **Related issues**

Fixes: [MUSD-352: Replace "Boost" with "Bonus"
Globally](https://consensyssoftware.atlassian.net/browse/MUSD-352)

## **Manual testing steps**

```gherkin
Feature: mUSD conversion bonus terminology

  Scenario: user sees mUSD conversion incentive wording
    Given user is viewing mUSD conversion entry points in the Earn flow

    When user views the conversion CTA and quick convert balance card
    Then the incentive is labeled as a "bonus" (not "boost")
```

## **Screenshots/Recordings**

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before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

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Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
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Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
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## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.



<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> Low risk copy-only change, but it renames i18n keys; any missed
references would surface as missing localized strings at runtime.
> 
> **Overview**
> Replaces **“boost”** wording with **“bonus”** across the mUSD
conversion entry points (asset overview CTA and quick convert balance
card), including MetaMetrics `cta_text` generation.
> 
> Renames the associated localization keys (e.g.,
`boost_title/description`, `percentage_boost` →
`bonus_title/description`, `percentage_bonus`) across supported
languages and updates affected unit/view tests accordingly.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
ff9faa7. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: Matt561

app/components/UI/Earn/Views/MusdQuickConvertView/components/MusdBalanceCard/MusdBalanceCard.test.tsx

@@ -54,15 +54,15 @@ describe('MusdBalanceCard', () => {
       expect(getByText(MUSD_TOKEN.symbol)).toBeOnTheScreen();
     });
 
-    it('displays percentage boost text from localization', () => {
+    it('displays percentage bonus text from localization', () => {
       const { getByText } = renderWithProvider(
         <MusdBalanceCard chainId={CHAIN_IDS.MAINNET} balance="$100.00" />,
         {
           state: initialRootState,
         },
       );
 
-      expect(getByText('3% boost')).toBeOnTheScreen();
+      expect(getByText('3% bonus')).toBeOnTheScreen();
     });
   });
 });

app/components/UI/Earn/Views/MusdQuickConvertView/components/MusdBalanceCard/MusdBalanceCard.tsx

@@ -71,7 +71,7 @@ const MusdBalanceCard = ({ chainId, balance }: MusdBalanceCardProps) => {
 
       <View style={styles.right}>
         <Text variant={TextVariant.BodyMDMedium} color={TextColor.Success}>
-          {strings('earn.musd_conversion.percentage_boost', {
+          {strings('earn.musd_conversion.percentage_bonus', {
             percentage: MUSD_CONVERSION_APY,
           })}
         </Text>

app/components/UI/Earn/components/Musd/MusdConversionAssetOverviewCta/MusdConversionAssetOverviewCta.test.tsx

@@ -435,7 +435,7 @@ describe('MusdConversionAssetOverviewCta', () => {
       });
 
       // Assert
-      const expectedCtaText = strings('earn.musd_conversion.boost_title', {
+      const expectedCtaText = strings('earn.musd_conversion.bonus_title', {
         percentage: MUSD_CONVERSION_APY,
       });
 
@@ -484,7 +484,7 @@ describe('MusdConversionAssetOverviewCta', () => {
       });
 
       // Assert
-      const expectedCtaText = strings('earn.musd_conversion.boost_title', {
+      const expectedCtaText = strings('earn.musd_conversion.bonus_title', {
         percentage: MUSD_CONVERSION_APY,
       });
 
@@ -534,7 +534,7 @@ describe('MusdConversionAssetOverviewCta', () => {
       });
 
       // Assert
-      const expectedCtaText = strings('earn.musd_conversion.boost_title', {
+      const expectedCtaText = strings('earn.musd_conversion.bonus_title', {
         percentage: MUSD_CONVERSION_APY,
       });
 

app/components/UI/Earn/components/Musd/MusdConversionAssetOverviewCta/MusdConversionAssetOverviewCta.view.test.tsx

@@ -474,7 +474,7 @@ describeForPlatforms('MusdConversionAssetOverviewCta', () => {
     ).toBeOnTheScreen();
   });
 
-  it('renders CTA with correct boost title text', () => {
+  it('renders CTA with correct bonus title text', () => {
     // Arrange
     const state = initialStateWallet()
       .withMinimalMultichainAssets()
@@ -507,7 +507,7 @@ describeForPlatforms('MusdConversionAssetOverviewCta', () => {
     ).toBeOnTheScreen();
   });
 
-  it('renders CTA with correct boost description text', () => {
+  it('renders CTA with correct bonus description text', () => {
     // Arrange
     const state = initialStateWallet()
       .withMinimalMultichainAssets()

app/components/UI/Earn/components/Musd/MusdConversionAssetOverviewCta/index.tsx

@@ -53,7 +53,7 @@ const MusdConversionAssetOverviewCta = ({
   const submitCtaPressedEvent = () => {
     const { EVENT_LOCATIONS, MUSD_CTA_TYPES } = MUSD_EVENTS_CONSTANTS;
 
-    const ctaText = strings('earn.musd_conversion.boost_title', {
+    const ctaText = strings('earn.musd_conversion.bonus_title', {
       percentage: MUSD_CONVERSION_APY,
     });
 
@@ -116,12 +116,12 @@ const MusdConversionAssetOverviewCta = ({
       {/* Text content in the center */}
       <View style={styles.textContainer}>
         <Text variant={TextVariant.BodySMMedium} style={styles.title}>
-          {strings('earn.musd_conversion.boost_title', {
+          {strings('earn.musd_conversion.bonus_title', {
             percentage: MUSD_CONVERSION_APY,
           })}
         </Text>
         <Text variant={TextVariant.BodySMMedium} color={TextColor.Alternative}>
-          {strings('earn.musd_conversion.boost_description', {
+          {strings('earn.musd_conversion.bonus_description', {
             percentage: MUSD_CONVERSION_APY,
           })}
         </Text>

locales/languages/de.json

@@ -5931,8 +5931,8 @@
       },
       "buy_musd": "mUSD kaufen",
       "get_musd": "mUSD erhalten",
-      "boost_title": "Erhalten Sie {{percentage}} % auf Ihre Stablecoins",
-      "boost_description": "Konvertieren Sie Ihre Stablecoins in mUSD und sichern Sie sich einen Bonus von bis zu {{percentage}} %.",
+      "bonus_title": "Erhalten Sie {{percentage}} % auf Ihre Stablecoins",
+      "bonus_description": "Konvertieren Sie Ihre Stablecoins in mUSD und sichern Sie sich einen Bonus von bis zu {{percentage}} %.",
       "powered_by_relay": "Unterstützt von Relay"
     },
     "bonus_claim": {

locales/languages/el.json

@@ -5931,8 +5931,8 @@
       },
       "buy_musd": "Αγοράστε mUSD",
       "get_musd": "Αποκτήστε mUSD",
-      "boost_title": "Λάβετε {{percentage}}% σε stablecoins",
-      "boost_description": "Μετατρέψτε τα stablecoins σε mUSD και λάβετε μπόνους έως και {{percentage}}%.",
+      "bonus_title": "Λάβετε {{percentage}}% σε stablecoins",
+      "bonus_description": "Μετατρέψτε τα stablecoins σε mUSD και λάβετε μπόνους έως και {{percentage}}%.",
       "powered_by_relay": "Υποστηρίζεται από το Relay"
     },
     "bonus_claim": {

locales/languages/en.json

@@ -6006,7 +6006,6 @@
       "ok": "OK",
       "continue": "Continue",
       "convert_and_get_percentage_bonus": "Convert and get {{percentage}}%",
-      "no_boost": "No boost",
       "your_musd": "Your mUSD",
       "balance_breakdown_title": "Your mUSD balances by network",
       "balance_amount": "{{amount}} mUSD",
@@ -6036,8 +6035,8 @@
       },
       "buy_musd": "Buy mUSD",
       "get_musd": "Get mUSD",
-      "boost_title": "Get {{percentage}}% on your stablecoins",
-      "boost_description": "Convert your stablecoins to mUSD and receive up to a {{percentage}}% bonus.",
+      "bonus_title": "Get {{percentage}}% on your stablecoins",
+      "bonus_description": "Convert your stablecoins to mUSD and receive up to a {{percentage}}% bonus.",
       "powered_by_relay": "Powered by Relay",
       "max": "Max",
       "quick_convert_button": "Convert",
@@ -6053,7 +6052,7 @@
           "title": "Convert max"
         }
       },
-      "percentage_boost": "{{percentage}}% boost",
+      "percentage_bonus": "{{percentage}}% bonus",
       "rate": "Rate"
     },
     "bonus_claim": {

locales/languages/es.json

@@ -5931,8 +5931,8 @@
       },
       "buy_musd": "Comprar mUSD",
       "get_musd": "Obtener USDC",
-      "boost_title": "Obtén un {{percentage}} % en tus monedas estables",
-      "boost_description": "Convierte tus monedas estables a mUSD y recibe un bono de hasta el {{percentage}} %.",
+      "bonus_title": "Obtén un {{percentage}} % en tus monedas estables",
+      "bonus_description": "Convierte tus monedas estables a mUSD y recibe un bono de hasta el {{percentage}} %.",
       "powered_by_relay": "Desarrollado por Relay"
     },
     "bonus_claim": {

locales/languages/fr.json

@@ -5931,8 +5931,8 @@
       },
       "buy_musd": "Acheter des mUSD",
       "get_musd": "Obtenir des mUSD",
-      "boost_title": "Obtenez {{percentage}} % sur vos stablecoins",
-      "boost_description": "Convertissez vos stablecoins en mUSD et recevez jusqu’à {{percentage}} % de bonus.",
+      "bonus_title": "Obtenez {{percentage}} % sur vos stablecoins",
+      "bonus_description": "Convertissez vos stablecoins en mUSD et recevez jusqu’à {{percentage}} % de bonus.",
       "powered_by_relay": "Propulsé par Relay"
     },
     "bonus_claim": {