Wiki page title doesn't match entered data (formatting lost)

We now have a separate field for a wiki page title (added in !10069 (merged)) but the problem is that it's ignored (or at least its case is ignored) when displaying the page, so we see things like "Ios" instead of "iOS":

I just noticed it's been already mentioned here https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10069#note_38451509 but without proper issue filed.

At first I suspected that the problem there is that the Title is a fake field, not stored anywhere and only used to generate a new slug. But it doesn't look like it's the case, since when I hit the edit button again my original "iOS" formatting is shown properly in the title field. So it has to be kept somewhere and it should be possible to use it for display.