Merge pull request #268 from Genshin/fix_simple_grades

Fix simple grades
[frontend] Fix students index search pagination
[frontend] Prefill students form fields with js from params[q]
Merge branch 'master' of github.com:Genshin/GAKUEngine
[frontend] Fix external_school_records/new fields
[frontend] Add edit to students/external_school_records
[wip] refactor
[wip] refactor
[wip] refactor
[wip] refactor
[wip] refactor
[wip] refactor spec's warning
[frontend] Class groups index refactoring
[frontend] Fix failing class_group specs
Merge pull request #269 from Genshin/class_groups

Class groups
[wip] refactor
Merge remote-tracking branch 'origin/master' into implement_grading_methods
fix bad "fixes", update locales