Fix crash trying to select text in an empty page
Merge pull request #470 from thotypous/fix-box-empty-page

Fix crash trying to select text in an empty page
Merge pull request #472 from chrox/master

calculate maximum global cache size from free RAM
rename language_po setting entry to language
update po
Merge pull request #475 from houqp/houqp-master

rename language_po setting entry to language
check link on the fly when tapping