EventMetrics should have a language audit to determine proper language support to add RTL support and some stronger language picking ability.
- Move the language picker to a popup (or separate page) so it only loads conditionally
- Use ULS for language picker, and use its data for RTL languages
- Add CSSJanus and conditional CSS for rtl languages
As reference, we can see a previous attempt to use ULS in EventMetrics in this (closed) issue: https://github.com/wikimedia/eventmetrics/pull/271