Attempt to support plural forms in the matches counter of the findbar (issue 10067)

[Snuffleupagus]

Based on a quick look at https://github.com/fabi1cazenave/webL10n/#pluralization, it seems that supporting plural forms shouldn't be as difficult as I first thought it might be.

Fixes #10067

[Snuffleupagus]

/botio-linux preview

[pdfjsbot]

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[timvandermeij]

Looks good. Thank you!

[flodolo]

CC @Pike @zbraniecki

Unfortunately this is not a complete fix. In order to allow locales to translate, you need to provide all forms in your .properties (one, two, few, many, other), not just the ones needed by English.

webl10n is a relic from the past (Firefox OS), and had a very hacky plural support.

It would be nice to take a look at Fluent, and see if PDF.js could be ported to that system (which is maintained, unlike webl10n).

[timvandermeij]

I'll create follow-up issues for both points.

[Snuffleupagus]

Unfortunately this is not a complete fix. In order to allow locales to translate, you need to provide all forms in your .properties (one, two, few, many, other), not just the ones needed by English.

I don't understand this comment, since there shouldn't be anything preventing a non-English locale from adding whichever of the one, two, few, many, other plural forms needed for a particular locale (regardless of what forms are required for English)!?
@flodolo Since I don't claim to understand the details of the localization process, could you please clarify what you mean here?

Also, keep in mind that as outlined in https://github.com/mozilla/pdf.js/blob/master/.github/CONTRIBUTING.md, the translations are imported from Firefox rather than maintained in this GitHub repo.

[flodolo]

I don't understand this comment, since there shouldn't be anything preventing a non-English locale from adding whichever of the one, two, few, many, other plural forms needed for a particular locale (regardless of what forms are required for English)!?

Locales don't work in editors. They work in tools that let you translate a string only if it exists in the original source (en-US). If en-US doesn't have [other], it simply won't be possible to translate (add) it.

P.S. I manage localization for Firefox ;-)

[flodolo]

BTW, just realized that this should have landed with a new ID :-\