Issue #1506304 by fabsor: Add the option to cache by content language.
Issue #1428196 by das-peter, fabsor: Allow users to set the cache key for panes.
Issue #1425936 by das-peter, fabsor: Added Store the detected cache bins to avoid invoking hook_flush_caches() multiple times.
Issue #1200634 by wxman, achton: Fixed Caching Panel Variants shows no Panel Panes.
Issue #1379630 by das-peter: Fixed Avoid strict warning: Creating default object from empty value.
Issue #1231394 by gmania: Fixed No input box to enter CID to clear a specific cache cid.
Fix mini panel action
Removes clear mini panel cache action
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