* Generalize dictionary worker * Add deleteDictionary functionality * Update DictionaryController to use DictionaryDatabaseModifier * Fix incorrect result handling
* Rename dictionary worker files * Rename classes * Rename file * Rename class * Generalize the _invoke method * Rename 'import' to 'importDictionary' * Improve DictionaryImporterMediaLoader usage * Refactor message handler * Generalize onProgress event