feat: Add Hindi and Russian translations

[Devvekariya711]

Description

Adds Hindi (हिन्दी) and Russian (Русский) language support to LibrePods for both Android and Linux platforms.

Files Changed

Android:

• android/app/src/main/res/values-hi/strings.xml (NEW - 218 strings)
• android/app/src/main/res/values-ru/strings.xml (NEW - 218 strings)

Linux:

• linux/translations/librepods_hi.ts (NEW)
• linux/translations/librepods_ru.ts (NEW)

Translation Details

• ✅ All placeholders preserved (%1$s, %d, etc.)
• ✅ UTF-8 encoding verified (Devanagari & Cyrillic scripts)
• ✅ Conversational style for better readability
• ✅ No untranslated strings

Review Request

Hindi and Russian speakers: Please review for natural phrasing and technical term accuracy. Suggestions welcome!

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds internationalization support by introducing a contributor guide, Hindi and Russian translations for Android string resources, and corresponding Hindi and Russian translation files for the Linux application.

Changes

Cohort / File(s)	Summary
Documentation CONTRIBUTING.md	Introduces comprehensive contribution guide covering Code of Conduct, development setup, building, submitting changes, and style guidelines with detailed examples.
Android Localization android/app/src/main/res/values-hi/strings.xml, android/app/src/main/res/values-ru/strings.xml	Adds Hindi and Russian translation files for Android UI strings. Russian file contains a syntax error (malformed attribute in noise\_control string element).
Linux Localization linux/translations/librepods_hi.ts, linux/translations/librepods_ru.ts	Introduces Hindi and Russian Qt Linguist translation files mapping UI source strings to corresponding translations for the Linux application.

Possibly related PRs

• feat : add French language support #342: Adds French locale Android string resources, extending the existing Android localization pattern introduced in this PR.
• i18n: add Traditional Chinese translations #365: Introduces localization resources for additional app locales across both Android and Qt platforms.
• linux(i18n): add Italian translations #375: Adds Qt Linguist translation files for the Linux application, continuing the i18n effort for desktop components.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the primary change: adding Hindi and Russian translations across Android and Linux platforms, which aligns with the main objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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[coderabbitai]

Actionable comments posted: 3

🤖 Fix all issues with AI agents

In `@android/app/src/main/res/values-ru/strings.xml`:
- Line 16: The XML attribute for the string entry is malformed — the attribute
`name` is missing an equals sign; update the <string> entry identified by the
`noise_control` resource so the attribute is correctly formatted (use
name="noise_control") to restore valid XML syntax in strings.xml.

In `@linux/translations/librepods_hi.ts`:
- Around line 1-87: The translation XML is malformed (spaces inside tags and
attributes and wrong XML declaration) — fix by regenerating or correcting the
file so tags are standard (e.g. replace '<?xml version="1.0" encoding = "utf-8"
?>' with a proper XML declaration, change '< message >', '< translation >', '<TS
version="2.1" language = "hi_IN" >' and other spaced tags to '<message>',
'<translation>', '<TS version="2.1" language="hi_IN">', trim trailing/leading
spaces inside element text (like '<name>Main</name>'), and normalize
indentation; best approach is to re-export the Hindi translations from Qt
Linguist (or manually remove the extra spaces and fix attribute quoting) so Qt
can parse elements such as message, source, translation, context, and TS
correctly.

In `@linux/translations/librepods_ru.ts`:
- Around line 1-87: The TS file is malformed: fix tag and attribute spacing and
trim trailing text spaces so Qt tools can parse it—replace occurrences of `<
message >`/`</ message >` and `< translation >`/`</ translation >` with
`<message>`/`</message>` and `<translation>`/`</translation>`, normalize the XML
declaration `<?xml version="1.0" encoding = "utf-8" ?>` to `<?xml version="1.0"
encoding="utf-8"?>` and the `<TS version="2.1" language = "ru_RU" >` to `<TS
version="2.1" language="ru_RU">`, trim trailing spaces inside every `<source>`
and `<translation>` text (e.g. source values like "Connected " → "Connected"),
and reindent/validate the overall structure so tags like `<TS>`, `<context>`,
`<name>Main</name>`, each `<message>` and its `<source>`/`<translation>`
children form a well-formed XML document acceptable to Qt Linguist/lrelease.

🧹 Nitpick comments (3)

linux/translations/librepods_hi.ts (1)

27-28: Consider translating "Adaptive" and "Settings" for consistency.

Several terms are left in English:

• Line 28: Adaptive
• Line 32: Adaptive शोर लेवल:
• Line 44: Settings

The PR mentions conversational Hindi was intentional, but common Hindi equivalents exist (e.g., "सेटिंग्स" for Settings). The Russian translation fully translates these terms ("Адаптивный", "Настройки").

Also applies to: 43-44

CONTRIBUTING.md (2)

217-223: Add language specifier to fenced code blocks.

Per markdownlint, these code blocks showing commit message format should have a language specifier for consistency.

📝 Suggested fix

-```
+```text
 <type>(<scope>): <description>

-```
+```text
 feat(android): add German translation

Also applies to: 235-239

---

330-333: Update the "Needed Languages" list.

This PR adds Hindi and Russian translations, but they're still listed as high-priority needed languages. Consider updating the list to reflect this PR's contributions.

📝 Suggested fix

 ### Needed Languages
 
-High-priority: German, Japanese, Korean, Hindi, Arabic, Russian
+High-priority: German, Japanese, Korean, Arabic