Internationalise plurals

[wbazant]

In English: 1 location, 2 ... locations
in Polish: 1 lokalizacja, 2,3,4 lokalizacje, 5, 6... lokalizacji

Pluralisation of Location.pdf

i18njs has support for it based on key conventions and a variable count.

We have a few of these to translate: Locations, Reviews, Types, Places, feet, kilometers, meters, miles, days.

Proposed plan:

• update i18njs to the newest version and resolve typecheck errors
• add new location strings for these in English locale
• auto-translate with translation manager, then remove orphan keys

[wbazant]

Maybe a good place to start is days and formatPeriodName in ActivityDiary.

[ezwelty]

@wbazant We had some plurals in the old translation files, and some of them were migrated over, others seemingly not. Some that were not migrated over: glossary.locations.one (https://github.com/falling-fruit/falling-fruit/blob/main/config/locales/en.yml#L139C1-L141C23), glossary.review.one, and glossary.tree_inventory.other.

Maybe a good place to start is days and formatPeriodName in ActivityDiary.

There is already time.days.one and time.days.other.