Only download content.json from Localazy.

[pixlwave]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

This PR tweaks the localazy script to only convert files inside of content.json.

Motivation and context

As part of element-hq/element-x-ios#2100 I'm going to try and add an InfoPlist.json so that we can translate our system alert prompts on iOS, and don't want this to affect Android. I think this simple filtering should be enough for each project to add any specific files that they require.

Screenshots / GIFs

Tests

• Run tools/localazy/downloadStrings.sh --all and see that it still works 🙈

Tested devices

• Physical
• Emulator
• OS version(s):

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[bmarty]

Thanks for being pro-active!
Everything is still working fine according to my tests.