fix code style in package model

related to #130
fix code style issues in package file model
fix code style in packages and translation model

related to #130
$context instead of $_context breaks editing packages. In fact not
needed anymore
Merge pull request #146 from javigomez/130g

fix code style in package model
Merge pull request #147 from javigomez/130h

fix code style issues in package file model
Merge pull request #148 from javigomez/130i

fix code style in packages and translation model
update
Merge remote-tracking branch 'upstream/develop' into develop
Bad copy/paste