More localization code is added to devtools

Additionally, the meta tag usage is updated to html5 standard.
Merge branch 'feature-DevtoolsTranslation' of github.com:olegabr/framework into norma-soft
Non-fatal error can be returned to the client side
Merge branch 'feature-qcubedImprovements' of github.com:olegabr/framework into norma-soft
Changes from a qcubed copy at norma-soft.ru