remove rescaleByDPI since it's not reversible
alternatively we store the original size before scaling by screen DPI
and use that value when needed.
enable Wikipedia support
Since wikipedia server is language specific we should first detect
language of the text by querying Google Translate. Make sure you have
access to both Google Translate and Wikipedia service to use this
function.
fix tap on word title will crash koreader
long press the backspace key will clear input text
update pot file
prompt users to turn on Wifi in OTA update and Wikipedia lookup
fix koboEnableWifi
fix missing declaration for symbol 'munmap'
strip punctuations in word before wikipedia lookup
use original lookup word in wikipedia lookup
Merge pull request #818 from chrox/master

enable Wikipedia support