StringDatabaseStorage::deleteStrings() does not work

Changes are made on on 11.x (our main development branch) first, and are then back ported as needed according to the Core change policies → .

Can the issue summary be flushed out some please

Proposed solution is a little vague, don't need code examples but how is this being solved.

Also recommend leaving all summary headers, if they are blank or NA.

Tried to improve issue summary.

Much better!