locales: update Marathi translation strings for core UI and headings

[Sudarshan-prog]

Updated translations for various UI elements in Marathi.

Feature Preview

No video preview required—this is a semantic data translation change for the local language file.

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While reviewing the localized interface configurations, I noticed several core user interface element strings and typography heading labels in the Marathi translation asset (mr-IN.json) were missing or left in English values.

This PR localizes those remaining elements into accurate, context-aware Marathi strings to provide a seamless native experience for desktop and mobile users.

Key Changes:

• Core App Elements: Localized "title" (शीर्षक), block interactions like "dragTooltip" (हलवण्यासाठी ड्रॅग करा), and shortcut system indicators.
• Mobile Navigation Layout: Localized structural mobile rich-text fields "mobileHeading1" through "mobileHeading6" into native numerical notation (हेडिंग १ - हेडिंग ६).

PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

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⚠️ Note to Maintainers: This patch was submitted via the browser-based editor to clear up translation gaps. The automatic language file generation script (generate_language_files.sh) will need to be executed upon merge or sync to update the accompanying backend Dart tracking files.

Summary by Sourcery

Update Marathi localization strings for core UI elements and heading labels.

New Features:

• Add Marathi translations for previously untranslated core UI text in the mr-IN locale.
• Add localized Marathi labels for mobile heading levels to improve rich-text navigation.

[CLAassistant]

All committers have signed the CLA.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates Marathi locale strings in mr-IN.json to replace remaining English UI labels and mobile heading titles with accurate Marathi translations for core UI elements and typography headings.

File-Level Changes

Change	Details	Files
Localized remaining English core UI labels into Marathi in the mr-IN locale file.	Replace English values for core app labels such as generic titles, tooltips, and interaction hints with Marathi equivalents Ensure translations preserve original semantic meaning and context for desktop and mobile UI flows Align terminology with existing Marathi localization style used elsewhere in the file	frontend/appflowy_flutter/assets/translations/mr-IN.json
Localized mobile rich-text heading labels for the Marathi locale.	Translate mobile heading fields (e.g., mobileHeading1–mobileHeading6) into Marathi using native numeric notation Keep heading ordering and keys unchanged while updating only the user-facing string values Confirm consistency of heading terminology with other heading-related translations in the locale file	frontend/appflowy_flutter/assets/translations/mr-IN.json

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