Merge pull request #1920 from mahagr/feature-hmvc

Merge branches 'master' and 'develop'
When subscribe option is present, the button isn't displayed correctly
Merge pull request #1922 from xillibit/k30_bugs7

Crypsis : When subscribe option is present, the button isn't displayed correctly
Merge branch 'feature-hmvc' of github.com:Kunena/Kunena-Forum into feature-hmvc
Fix typo in content plugin language key
Fix topic/message preloading on missing items
Merge branch 'develop' of github.com:mahagr/Kunena-Forum into feature-hmvc
Merge branch 'feature-hmvc' of github.com:mahagr/Kunena-Forum into rtv3