auto translation from po to json

[yashwanth535]

Checklist

• I have read the OpenWISP Contributing Guidelines.
• I have manually tested the changes proposed in this pull request.
• I have written new test cases for new code and/or updated existing tests for changes to existing code.
• I have updated the documentation.

Reference to Existing Issue

Closes #902

Please open a new issue if there isn't an existing issue yet.

Description of Changes

Added a Node.js script (config/convert-po-to-json.js) to automate conversion of .po files to .json format using ttag po2json.

Reads from i18n/en.po and generates client/test-translation.json.

Parses the output to ensure clean, formatted JSON.

Prevents manual editing of test-translation.json, reducing human error and improving consistency across test snapshots.

Screenshot

Please include any relevant screenshots.

[pranshustuff]

I just checked out your PR and here's a few notes:

1. Please keep the commit message in the format as mentioned in the documentation

2. The package-lock.json and yarn.lock changes are not needed. Also remove changes to the client/test-translations.json.

3. There's an issue with your solution at the moment. While converting from .po to .json the header section's keys are capitalised like so:

  "headers": {
    "Language": "en",
    "MIME-Version": "1.0",
    "Content-Type": "text/plain; charset=UTF-8",
    "Content-Transfer-Encoding": "8bit",
    "Plural-Forms": "nplurals = 2; plural = (n != 1);"
  },

Instead of:

  "headers": {
    "language": "en",
    "mime-version": "1.0",
    "content-type": "text/plain; charset=UTF-8",
    "content-transfer-encoding": "8bit",
    "plural-forms": "nplurals = 2; plural = (n != 1);"
  },

This can cause problems later on. Please take care of this.