* DRY up membership selector
Selectors should be chained up, not copy/pasted.
* PremiumBadge: retrieve membership db internally instead of from parent
## Ticket
1753 odyseeMembershipByUri function causing unnecessary renders
## Issue
While the rendering issue in the ticket is due to the way the props are defined, it also surfaced a prop-drilling issue with PremiumBadge.
Instead of asking the parent for the membership db, it can retrieve from Redux itself. This prevents the prop from polluting 2 levels of components and causing unnecessary renders.
## Approach
- Make `PremiumBadge` accept `uri` like most other components.
- I still leave the `membership` prop as (i.e. parent can still pass it directly). In some cases (e.g. `livestreamComment`, `page/odyseeMembership`), the parent itself needs the same data, so we don't need to derive it twice.
- 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.
