fix(android): Auto-mirror increment and decrement arrows for RTL support 📟

[darcywong00]

Follows #12227 and #12228 for #12215

This fixes the increment/decrement arrows on the "Text Size" dialog to be RTL compatible.
In RTL locales, the decrement arrow points to the right and increment arrow points to the left.

Also refactored the "Text size: " string so the numerals appear with regular Arabic numbers.

Screenshot

User Testing

Setup - Install the PR build of Keyman for Android on an Android device/emulator. Then in Keyman for Android, change the display language to Arabic (an RTL language)

TEST_TEXT_SIZE - Verifies arrow keys on Text Size dialog are RTL compatible

1. Launch Keyman for Android where the display language is Arabic.
2. From the Keyman menu --> Text Size
3. On the "Text Size" dialog, verify the decrement arrow pointing right makes the text size smaller
4. On the "Text size" dialog, verify the increment arrow pointing left makes the text size bigger

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_TEXT_SIZE (PASSED) (notes)

[dinakaranr]

Test Results

• TEST_TEXT_SIZE (passed):

I retested this issue with the attached "Keyman 18.0.93-alpha-test-12230" build on the Android 14 physical device and Android 12(emulator) Here is my observation.

1. Installed the "Keyman-18.0.93.apk" file and gave all permissions to the application.
2. Checked the "Enable Keyman as system-wide keyboard" and set the keyboard as the default keyboard box on the settings page.
3. Selected the "arabic Phonetic(SIL)" default keyboard.
4. Open the Keyman app. Enable the "Predictions" to install the "Dictionary."
5. Change the display UI to "Arabic" by settings/Display Language.
6. Added a sentence to the notepad.
7. Open the "Text size" dialog.
8. Verified the decrement arrow pointing right make the text size smaller when clicking it.
9. Verified the increment arrow pointing left makes the text size bigger when clicking it.
   Hence, It looks good now. Thank you.

[keyman-server]

Changes in this pull request will be available for download in Keyman version 18.0.94-alpha