[ci skip] Serbian translations update

fixed twig example in tpl engines tutorial

[ci skip] Create russian translation of runtime-request.md

[skip ci] Update structure-applications.md

опечатки в названиях событий

Fixes #4909: updated application lifecycle diagram to use "request component" and "response component" instead of "request" and "response" in order to prevent confusion

Added note about bootstrap version.

[skip ci] Added missing russian translation for asRelativeTime() formatter

Fix for recursive calls ArrayHelper::toArray() with objects

[skip ci] add structure-application-components.md [UK]

Fix upgrade doc [skip ci]

docs/guide/structure-views.md - missing ".php" added [ci skip]