Merge branch 'master' of github.com:h5p/h5p-php-library
Merge branch 'master' of github.com:h5p/h5p-php-library
Merge branch 'master' of github.com:h5p/h5p-php-library
Merge branch 'master' of github.com:h5p/h5p-php-library
Fix for language containing empty string in H5P export (h5p.json)
Merge branch 'master' of https://github.com/h5p/h5p-php-library
Merge branch 'fix-for-empty-string-language-in-h5p-json'
Merge branch 'master' into stable