Language map editor refinement

[stephenwf]

Example of single value: https://deploy-preview-217--manifest-editor-testing.netlify.app/#?app=storybook&story=Rich%20Text%20Language%20Field&component=defaultExample

Multi-values are available in the main editor (label/summary etc.)

There are handful of actions/state changes:

• Changing language
• Rich text -> HTML (visual)
• HTML -> text (removes HTML tags)
• text -> HTML
• Removing the whole value - only when in a list
• Adding "complex" HTML tags (e.g. link, which shows a popup)

The primary goal is for the user experience to be as close to a normal <input /> as possible with the option to go into the language/html as required. Simply due to the volume of these input boxes that can appear on a single page when editing long lists of items.