Localization

[MattiasBuelens]

Web UI should support multiple languages.

• You should be able to replace all human-readable messages in all UI components with a translated version.
• Ideally, you should be able to switch between languages dynamically, without reloading the webpage.

[MattiasBuelens]

Lit supports localization, but it's probably too big of a change to migrate the entire project to Lit. Also, since Lit version 3 dropped support for legacy browsers, we might not be able to support older smart TVs.

Perhaps we can use some parts of Lit's localization? For example, use their msg function and their runtime mode, but don't use their automatic re-rendering? 🤔