Make Async::tags() DB agnostic
Make Async::populartags() DB agnostic
Remove MySQL backticks from DatabaseDataCollector
Add preg_replace twig filter
Merge pull request #2171 from rarila/twig_preg_replace

Add preg_replace twig filter
Merge pull request #2188 from GawainLynch/hotfix/postgres-tag-queries

PostgreSQL backtick cleaning