Make LocaleChooser responsive

[obulat]

Positioning of LocaleChooser is updated with css grid properties. This PR updates styling of the App and LocaleChooser components to be mobile-first.

Fixes

Fixes #164 by @JackieBinya

Description

Update to the LocaleChooser and App styles: makes them mobile-first, and fixes the issue of not showing locale chooser on screens smaller than 1024px.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[akmadian]

I assume this is ready, and it looks good to me :) Approved!

[akmadian]

@obulat Since I'm not sure if this is ready to be merged, I'll leave it to you to push the button :)

[obulat]

Thank you, Ari! It is ready and I'm merging.