Extract UI strings to lang files; add de/ru/ja translations; minor code polish

- Extract all ~30 hardcoded English strings from admin.php to lang/en/lang.php
and translate to de, ru, ja (menu labe

Extract UI strings to lang files; add de/ru/ja translations; minor code polish

- Extract all ~30 hardcoded English strings from admin.php to lang/en/lang.php
and translate to de, ru, ja (menu label already existed; all new keys added)
- Remove redundant require_once for PatchedTar (PSR-4 autoloader handles it)
- Fix memory_limit: only raise to 256M, never lower a higher configured value
- Add $visitedPaths guard in walkInto() to skip duplicate files reached via
multiple symlink paths
- Bump plugin.info.txt date to 2026-05-31
- README: note that str_starts_with() is polyfilled by DokuWiki (PHP 7.4 ok)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Review: guards, input handling, @ suppression, docblocks, translations

- Add DOKU_INC guard to admin.php
- Replace $_SERVER['REQUEST_METHOD'] and $_SERVER['HTTP_HOST'] with $INPUT->server->str()
- R

Review: guards, input handling, @ suppression, docblocks, translations

- Add DOKU_INC guard to admin.php
- Replace $_SERVER['REQUEST_METHOD'] and $_SERVER['HTTP_HOST'] with $INPUT->server->str()
- Remove @ error suppression; use is_file() checks where file existence is uncertain
- Remove redundant getMenuText() override (parent getLang('menu') suffices)
- Replace strpos() prefix check with str_starts_with()
- Add return type hints and docblocks to all public/protected methods
- Add de, ru, ja translations for lang['menu']
- Update plugin.info.txt date; update README to reflect language files

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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