Add log if preference keys are empty
Flip reload icon horizontally

Same orientation as Chrome
Disable show tabs on tablets

There is no tab overview on tablets as tabs are displayed above the
address bar
Don't hard code some strings
Add donate preference
Move menu item modification to a separate fragment
Remove menu item from some fragments

Remove load default values item from main and sub item preference
fragments
Fix load default values on new installs

Issue caused by c32b11d4f76de75ae8a70a9623740afefc2be206
Slightly reduce size of remove preference button
Use maximum slice constant