Add Hebrew deck translation

[mikecrawford99]

Summary

• Add Hebrew (HE) as a supported language across note data, note model metadata, deck recipes, deck descriptions, and documentation.
• Add reusable RTL support to the generated note model templates via __TEXT_DIRECTION__ and __IS_RIGHT_TO_LEFT__.
• Add Hebrew translations for countries, capitals, country/capital info, capital hints, and flag similarity text.
• Add Hebrew deck builds for standard, extended, and experimental variants.
• Add a static Hebrew deck description and update existing deck descriptions/README language lists to include Hebrew.

Implementation

• src/note_models/translations.csv now includes text direction metadata for all languages and Hebrew template substitutions.
• Textual Anki fields now receive is_right_to_left metadata where applicable.
• Card templates wrap rendered card content in dir="__TEXT_DIRECTION__" so Hebrew cards render right-to-left while existing languages remain left-to-right.
• recipes/source_to_anki.yaml and recipes/source_to_anki_[experimental].yaml now build Hebrew decks and include guid:he.
• src/headers/desc_he.html is tracked as a static localized deck description, matching the pattern used by the other deck descriptions.
• CONTRIBUTING.md documents the Hebrew translation source convention.

[aplaice]

Thanks very much! Unfortunately, I can't review the actual translations, but the "plumbing" all looks fine! (Good catch on the previously unreplaced Hint in the template! Thanks!)

For the card text direction, we could probably also set it via css, rather than the div dirs but it'd require templating of the CSS, so this is probably simpler (and probably more flexible (?), in case we ever need mixed text direction in cards).

[mikecrawford99]

@aplaice:

Thanks very much! Unfortunately, I can't review the actual translations, but the "plumbing" all looks fine! (Good catch on the previously unreplaced Hint in the template! Thanks!)

For the card text direction, we could probably also set it via css, rather than the div dirs but it'd require templating of the CSS, so this is probably simpler (and probably more flexible (?), in case we ever need mixed text direction in cards).

Awesome, thanks! Yeah, I figured the divs were the safest bet for flexibility.
Do you know around when you'll be able to merge this in?

[aplaice]

Do you know around when you'll be able to merge this in?

We usually wait a while in case anyone else has additional feedback (especially from the core team), but given that none of the core team speaks Hebrew and given that there's a chance of significant structural changes in the near future, I'm merging this now. (If there's need we can always edit later.)

May I add you to the translators list?

[mikecrawford99]

Do you know around when you'll be able to merge this in?

We usually wait a while in case anyone else has additional feedback (especially from the core team), but given that none of the core team speaks Hebrew and given that there's a chance of significant structural changes in the near future, I'm merging this now. (If there's need we can always edit later.)

May I add you to the translators list?

Sure, no problem.