[IMPROVEMENT] Improvements in Russian translation

[IMPROVEMENT] Added text and description fields for Image Attachment

# Conflicts:
#	app/build.gradle
#	app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt
#	app/src/main/res/values-hi-rIN/strings.xml
#	settings.gradle

merge

[FIX] Member, Pinned, Favorite and File list not showing bug.

[IMPROVEMENT] Uses framework's Bottomsheet

[NEW] Allow room names whit special chars

[NEW] Set user agent

[IMPROVEMENT] About activity to fragment