cs "česky, čeština" translation #1510. Author: Anonymous.
Fix flattr button
ja "日本語" translation #1513. Author: tokyo7.
ja "日本語" translation #1514. Author: tokyo7.
update japanese translation
update wiki css
Merge branch 'master' of github.com:ornicar/lila

* 'master' of github.com:ornicar/lila:
  Fix double '/' in URLs when exporting
add square banner
quote replacement in url regex
make all regex replacements safer
ro "Română" translation #1519. Author: wsdookadr.