[bonelifer]

Adds a feature check and a screenshot recipe for the new Translation Helper extension.

Feature check (feature_checks.py)

check_translationhelper makes its own fixture extension (thcheck/demo) and a test sv language, so it runs on a plain setup-board.sh board and on any seed-forum board. It checks that:

• the extensions page lists the fixture, and the editor shows its untranslated strings;
• saving writes a language file that gives back exactly what was typed (quotes, a backslash, HTML and a literal <?php stay text), and a copy is saved in store/;
• uploading a release ZIP, and uploading two loose language files in the one field, each add an older English version;
• after the fixture's folder is replaced by a new version, the translation is put back, the extensions page says so, and the new string gets the English text;
• the changed string shows its old and new English, and English text is shown escaped.

It removes the fixture extension and its saved translation afterwards, since a database reset doesn't undo files.

Screenshots (screenshots.py)

shots_translationhelper uses seed-forum's Translation Helper fixtures (phpbbmodders/seed-forum#33) to save the extensions page with the "put back" notice, the editor with a changed string, the Older English versions page and the settings. It removes the fixture files afterwards. The README describes it.

Testing

Claude ran the feature check on a setup-board.sh board (14/14) and through db-matrix.sh on phpBB 3.3 and 4.0 with SQLite, MySQL, MariaDB, PostgreSQL and MSSQL (18/18 on each board, including the disable/purge/enable round trip). The screenshot recipe produced the four images now in the extension's docs/images/screenshots/.

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Investigated and written by Claude on behalf of William Jacoby (bonelifer).