misc: unify terminology

Accept contact request → Accept invitation
Accept in audio → Accept with audio
Accept in video → Accept with video
Automatically answer calls → Automatically answer incoming calls
Decline call request → Decline call
Decline contact request → Decline invitation
Delete your account → Delete account
just now → Just now
Mute → Mute microphone
Type → Conversation type (https://review.jami.net/c/jami-client-android/+/29546)
Unmute → Unmute microphone

Change-Id: Ie88eabeb12514e2b0f0918c8ab77beaa0d90aecf
GitLab: #1730