network: fix vpn active state if network offline

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/603676493bad43cb85fc2a0d8bdd559a/
Change-Id: I4827a97bc1274915339862329837a03673b94698
accounts: add username checker

update accounts username error mesage

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/11c3071925424785ab08de8d827b52bc/#b03a4ef4409f4fce912130debdfe9bce
Change-Id: I8e039353c2c5c83b1c05b32a0ec0afea003ebecf
launcher:: fix typo.

others category gets wrong name.

tower: https://tower.im/projects/1c0cd0c59ef941298c6e6b2ba6833b91/todos/9a3dfb87020c4695af3872f1816d7c99/

Change-Id: I2ec7c896703cca8c0901659332fbcf4fbbd2ae50
appearance: compare Theme info before update

Change-Id: Ic58481f3f1a89845e55733a518f41f7d2e0550fa