fix(i18n): fix fa/el translation placeholders for config value errors

[aryansk]

Fixes #14347

Problem

msgfmt -c fails for Persian (fa) and Greek (el) locales, blocking django-admin compilemessages / sphinx.locale compilation for every user of those locales:

• fa: "{permitted}" should be "{default.__name__}" in the defaults to message (copy-paste from the expected message)
• el: unterminated '{name]' → '{name}', '[current__name__}' → '{current.__name__}', and '{current__name__}'/'{default__name__}' → '{current.__name__}'/'{default.__name__}' (missing dot)

Both are fatal python-brace-format errors.

Change

• sphinx/locale/fa/LC_MESSAGES/sphinx.po:599 — {permitted} → {default.__name__}
• sphinx/locale/el/LC_MESSAGES/sphinx.po:591 — '{name]' → '{name}', '[current__name__}' → '{current.__name__}'
• sphinx/locale/el/LC_MESSAGES/sphinx.po:598 — '{current__name__}' → '{current.__name__}', '{default__name__}' → '{default.__name__}'

Keep unrelated cleanup out of this PR.

Why this approach

The msgid strings use {name}, {current.__name__}, {permitted}, {default.__name__}; the msgstr must use the same brace-format placeholders. Fixing the placeholders to match msgid makes msgfmt -c pass and restores the correct interpolated values. No code change needed.

Testing

command: msgfmt -c sphinx/locale/fa/LC_MESSAGES/sphinx.po -o /tmp/fa.mo
result: ok (was fatal before)

command: msgfmt -c sphinx/locale/el/LC_MESSAGES/sphinx.po -o /tmp/el.mo
result: ok (was fatal: "a format specification for argument 'default.__name__' doesn't exist")

command: git diff --check
result: clean

Documentation and release impact

• User-facing translation fixed
• Changelog/release note needed: i18n fix
• Migration or compatibility note needed
• No documentation impact

Review notes

• Known limitations: none
• Follow-up issue, if any: none
• Security/licensing considerations: none

[jdillard]

Closing this due to the contribution policy on translation files. The proper fix is outlined in this comment: #14347 (comment)

We do not accept pull requests altering the translation files directly. Instead, please contribute translations via the Transifex platform.