refactor: replace numeric translation keys with named keys
- Extract shared i18n.sh library with tr() function (replaces 5 duplicated text_lang functions) - Replace numeric IDs (001, 002, ...) with human-readable keys (already_started, delete, etc.) - Update all language files (en_US, en_GB, de_DE) to use named key format - Update all scripts (jdautoenc, rename, addrename, removerename, config) to use tr() from i18n.sh
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