In case there's anyone still struggling with this, my solution was to manually go into the DB and remove from the table mdl_tool_customlang_components the plugins that are no longer installed on my system.
Additional errors may continue to pop up indicating that there are other dead plugin components to remove, simply search for them in the above named table and delete them until you get the all clear to save your customized language strings.
Hope this is helpful.
Additional errors may continue to pop up indicating that there are other dead plugin components to remove, simply search for them in the above named table and delete them until you get the all clear to save your customized language strings.
Hope this is helpful.
