**We have this**
Changes (add/edit/delete) to captions and statement can't current be saved in IE11.
This is because IE11 doesn't set the `Origin` header for these cross-wiki requests, and we receive a `403`.
The forms behave exactly like they do when there's another error, except that no error message shows up (because there's no actual error message in the response body)
**We want this**
Ideally, SDoC also works in IE11 (because MediaWiki officially still support it).
But this could be a pretty tough nut to crack ([more info on SO](https://stackoverflow.com/questions/20784209/internet-explorer-11-does-not-add-the-origin-header-on-a-cors-request)), so we might have to settle for showing some error message, so that IE11 users at least know something went wrong.
**Acceptance Criteria**
[] It is possible to submit captions and statement changes in IE11 (prefered)
or
[] In IE11, the JS widgets are not loaded, essentially not even providing edit tools (backup plan)
or
[] It is impossible to submit caption and statement changes in IE11, but an error message is displayed clarifying this (last resort, but we should probably do this anyway for unidentified errors)