Update CHANGELOG.md

Portugese Translation added

Update README.md

Updated GPM link

Release 1.2.2

Release 1.2.2, reorganization of assets because sometimes still didn't appear

Release 1.2.1

Solved a problem that the button did not disappear even after admin was not logged in anymore

Version 1.0.12.1

Bugfix on admin login check

Version 1.0.12

Button didn't always disappear when needed

Release 1.0.11

Correction of the bug that kept on refreshing even after logout

Version 1.09 and version 1.10 modfications

Modified README

1.0.7 (added some credits)