feat: add standard icon association for localization/language files

[SethFalco]

Similar to how most image formats (WEBP, AVIF, PNG, JPG, GIF, etc) have an icon association to depict that they are images, could there please be a conventional icon for localization files?

By default, this icon would be associated with formats like:

• XLIFF (*.xlf)
• TMX (*.tmx)
• Fluent (*.ftl)
• PO (*.pot / *.po)
• etc

Some extensions may choose to reuse the icon for custom formats. Other broader file formats (like *.json) that extensions know to be a language file in the context of the libraries/stack used may use the icon as well.

Related

• Originally discussed in https://github.com/projectfluent/fluent/issues/356

[daviddossett]

I think this is something that would have to be added to https://github.com/jesseweed/seti-ui, the default file icon font used by VS Code. From there we may have to do more work to actually render it where appropriate. @isidorn may have more details there since we've talked about new icons in Seti before.

[isidorn]

Yes, I think that is all there is to it. Adding to the seti built-in theme. But I would not add this right away, I suggest we keep this issue open to gather more user feedback.