[Android] Unable to filter non-latin native language names

[petercpg]

Describe the bug
On Android, language filter in Preference only accepts input in English, so it's not possible to restrict the list into non-Latin languages are not able to be .

VPN version:
2.25.0 (2.202409190619)

Affected Platforms:

• Android: Google Pixel 6 Pro / Android 14 / Gboard 14.6.04.665297282 Beta
• This issue does not effect iOS / Windows.

Prerequisites:
N/A.

Steps to reproduce:

1. Tap Gear icon -> Preference -> Language
2. Tap filter, attempt to search "日本語", "Traditional", or "zh-CN"
3. Observe filter results

Expected result:

1. Should accept all kinds of IME with any keyboard layout.
2. All characters should be able to enter into the filter, and the list should reflect the matched languages
3. (nice to have) in addition to locale native names, accept their name in English and locale code for filter.
   1. However on Windows 11, entering "法文" shows French in the list

Actual result:

1. Regardless of keyboard being selected, only accepts US (QWERTY) keyboard, and not possible to enter non-latin words. Alphabets with diacritic marks are accepted though.
2. Affected locales: Traditional Chinese, Simplified Chinese, Japanese, Punjabi, Lao, Greek, Russian, Ukrainian

Additional notes:
N/A