Add sizes attribute to favicon
Replacing is_a with instanceof.

is_a was deprecated in PHP 5, 5.1, and 5.2. Then it was undeprecated. We can use instanceof achieve the same thing. So here we are.

Fixes #2446.
Merge pull request #2445 from anatolbroder/feature/favicon

Add sizes attribute to favicon
Fixing Some Blog Items

- Wrong variable call in blog view
- Wrong blog lang variable in the spanish language.
- Random code formatting.

Fixes #2444
Merge branch '2.2/develop' of github.com:pyrocms/pyrocms into 2.2/develop
Merge pull request #2455 from khalil-tabbal/2.2/develop

2.2/develop - blog module : french translations & corrections