- Forgot that we've concluded to not translate 'Premium/Premium+' and keep that as a product name. This is the same as competitors.
- For other instances of "Premium" in a longer string, we'll just have to communicate with translators to not translate it.
- Remove a few old strings.
- Variable names are for translators to determine the context, so choose more relevant names. e.g 'displayedInterval' and 'date_range' will not make much sense to a non-programmer.
- No need to localize dev-only strings.
- Various other fixes.
