Revise welcome screen video and still image

java/res/layout-land/setup_steps_screen.xml

java/res/layout-land/setup_welcome_screen.xml

java/res/layout/setup_welcome_video.xml

java/res/raw/setup_welcome_image.png

java/res/raw/setup_welcome_video.mp4

...es/values-h1200dp-port/setup-dimens-large-tablet-port.xml

.../res/values-h330dp-land/setup-dimens-large-phone-land.xml

...res/values-h520dp-land/setup-dimens-small-tablet-land.xml

.../res/values-h540dp-port/setup-dimens-large-phone-port.xml

...res/values-h720dp-land/setup-dimens-large-tablet-land.xml

...res/values-h800dp-port/setup-dimens-small-tablet-port.xml

java/res/values-land/setup-dimens-small-phone-land.xml

java/res/values-port/setup-dimens-small-phone-port.xml

java/res/values/colors.xml

.../android/inputmethod/latin/setup/SetupWizardActivity.java