feat(l10n): enable i18next plurals

[danielweck]

Fixes #2660

Follow-up to PR #2743
We need to adapt the i18n tooling (check, scan, sort, typed)

Also see:
felixmosh/i18next-locales-sync#40
jwbay/i18next-json-sync#22

[danielweck]

i18next compatibilityJSON v4

I fixed Weblate (was v3)

thorium-reader/src/common/services/translator.ts

Line 52 in 2f6b212

compatibilityJSON: "v4",

thorium-reader/package.json

Lines 78 to 79 in 2f6b212

	"i18n-scan": "node ./scripts/translate-scan.js \"src/resources/locales/und.json\" && i18next-locales-sync --compatibilityJSON v4 --localesFolder ./src/resources/locales/ --primaryLanguage und --secondaryLanguages en ta tr ar cs sl bg ca da de el es eu fi fr gl hr it ja ka ko lt nl pt-br pt-pt ru sv zh-cn zh-tw --spaces 4 --useEmptyString true && rimraf \"src/resources/locales/und.json\"",
	"i18n-check": "i18next-locales-sync --compatibilityJSON v4 --localesFolder ./src/resources/locales/ --primaryLanguage en --secondaryLanguages ta tr ar cs sl bg ca da de el es eu fi fr gl hr it ja ka ko lt nl pt-br pt-pt ru sv zh-cn zh-tw --spaces 4 --useEmptyString true",

https://www.i18next.com/misc/json-format#i18next-json-v4

[danielweck]

https://docs.weblate.org/en/latest/user/translating.html#plurals

https://www.i18next.com/translation-function/plurals

EN "one" "other"

thorium-reader/src/resources/locales/en.json

Lines 142 to 143 in 31f5ace

	"descList_one": "{{- count}} note {{- creator}} will be imported into '{{- title}}' {{- author}}",
	"descList_other": "{{- count}} notes {{- creator}} will be imported into '{{- title}}' {{- author}}",

FR "one" "many" "other"

thorium-reader/src/resources/locales/fr.json

Lines 142 to 144 in 31f5ace

	"descList_one": "{{- count}} note {{- creator}} sera importée vers {{- title}} {{- author}}",
	"descList_many": "{{- count}} note(s) {{- creator}} seront importées vers {{- title}} {{- author}}",
	"descList_other": "{{- count}} notes {{- creator}} seront importées vers {{- title}} {{- author}}",

Weblate: https://hosted.weblate.org/translate/thorium-reader/thorium-reader-translation/en/?checksum=57a2578b136eb3c1#translations

Confirmed by i18next tooling:

https://jsfiddle.net/6bpxsgd4

i18next and Weblate are consistent with the specification:

https://cldr.unicode.org/index/downloads