Fix languang list can't shou all and make list scroll to selected item on init

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/7fd7d0f311bf4cc28e31ec11fcda0574/

Change-Id: Ifb8ebb76b051ead8bdf80e033975c65cb09eb9dc