Always add English keywords even when the system is using another language

Fushan Wenrequested to merge
work/fusionfuture/FEATURE446285-always-add-eng-keywords into master
  1. FEATURE: Always add English keywords to the list of keywords.
  2. Add doesRemoveDuplicates bool parameter to MenuItem::keywords, so removeDuplicates() will not be done in the subitems to improve the performance.
  3. Port away from deprecated KPluginMetaData::readTranslatedString to KJsonUtils::readTranslatedString.
  4. Port away from foreach in MenuItem::keywords.
  5. Add const keyword to MenuItem::keywords.

FEATURE: 446285 FIXED-IN: 5.24

Merge request reports