Load templates asynchronously

Fix style issues

Style: Add catch

Fix databinding for templates

Cleanup

Add specs

Add missing issuableTemplateNamesPath to fix specs

Fix karma specs: replaced calls of openForm with new method

Disabled unused vars because this import is needed

Cleanup: This should no longer be needed

Fix specs: remove field from expected result

Applied suggestion and spy on updateAndShowForm method

Applied code review suggestions for frontend code refactoring

Move template names request to service

Change name of template names url to description_templates/names

Remove coding comment

Fix specs for Epics

Fix rubocop issue