Update i18n tokens and locale files

[hannahblair]

Description

This PR:

• Extracts a bunch of hardcoded strings into translation files
• Refactors our translation files such that we have a common key and a key for each component. Every key should be snake case and lowercase. Example format:

{
    "common": { ... } // strings shared throughout may components
    "audio": { } // strings specific to each component
    "button": { }
    ... 
}

• Removes a few translations that aren't used anywhere in our repo. e.g. Flag, Empty, Interpret, Examples

Closes: #1078

🎯 PRs Should Target Issues

Before your create a PR, please check to see if there is an existing issue for this change. If not, please create an issue before you create this PR, unless the fix is very small.

Not adhering to this guideline will result in the PR being closed.

Tests

1. PRs will only be merged if tests pass on CI. To run the tests locally, please set up your Gradio environment locally and run the tests: bash scripts/run_all_tests.sh

2. You may need to run the linters: bash scripts/format_backend.sh and bash scripts/format_frontend.sh

[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Website	ready!	Website preview
	Storybook	building...
	Visual tests	building...
🦄	Changes	detected!	Details

---

Install Gradio from this PR

pip install https://gradio-builds.s3.amazonaws.com/527a24d7735338eb6ec8436af47b2140d5d3e7c5/gradio-3.40.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@527a24d7735338eb6ec8436af47b2140d5d3e7c5#subdirectory=client/python"

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/annotatedimage	minor
@gradio/app	minor
@gradio/atoms	minor
@gradio/audio	minor
@gradio/checkbox	minor
@gradio/checkboxgroup	minor
@gradio/code	minor
@gradio/colorpicker	minor
@gradio/dataframe	minor
@gradio/dropdown	minor
@gradio/file	minor
@gradio/gallery	minor
@gradio/highlightedtext	minor
@gradio/image	minor
@gradio/label	minor
@gradio/model3d	minor
@gradio/number	minor
@gradio/plot	minor
@gradio/radio	minor
@gradio/slider	minor
@gradio/statustracker	minor
@gradio/upload	minor
gradio	minor

• Maintainers can select this checkbox to manually select packages to update.

With the following changelog entry.

Update i18n tokens and locale files

Maintainers or the PR author can modify the PR title to modify this entry.

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• If the bot has failed to detect any changes, or if this pull request needs to update multiple packages to different versions or requires a more comprehensive changelog entry, maintainers can update the changelog file directly.

[aliabid94]

I am getting this error now in the browser console (page does not load):

Uncaught (in promise) Error: [svelte-i18n] Cannot format a message without first setting the initial locale.
    at os (runtime.esm.js:1:5583)
    at Gs (Index.svelte:99:21)
    at At (Component.js:123:5)
    at new tn (Index.svelte:237:57)
    at e.connectedCallback (main.ts:78:15)

[hannahblair]

thanks for testing @aliabid94! issue fixed