Merge branch '1251-dark-theme-old-message-bubbles' into 'master'

...ava/org/briarproject/briar/android/blog/BlogFragment.java

...ava/org/briarproject/briar/android/blog/FeedFragment.java

...g/briarproject/briar/android/forum/ForumListFragment.java

...ct/briar/android/privategroup/list/GroupListFragment.java

...r-android/src/main/res/drawable/social_send_now_white.xml

...oid/src/main/res/layout-land/fragment_keyagreement_id.xml

...-android/src/main/res/layout/activity_change_password.xml

briar-android/src/main/res/layout/activity_expired.xml

briar-android/src/main/res/layout/activity_password.xml

...-android/src/main/res/layout/activity_rss_feed_import.xml

...-android/src/main/res/layout/fragment_keyagreement_id.xml

...ndroid/src/main/res/layout/fragment_setup_author_name.xml

briar-android/src/main/res/layout/fragment_setup_doze.xml

...r-android/src/main/res/layout/fragment_setup_password.xml

...oid/src/main/res/layout/list_item_conversation_msg_in.xml

...id/src/main/res/layout/list_item_conversation_msg_out.xml

.../src/main/res/layout/list_item_conversation_notice_in.xml

...src/main/res/layout/list_item_conversation_notice_out.xml

...id/src/main/res/layout/list_item_conversation_request.xml

briar-android/src/main/res/layout/power_view.xml