This patch fixes the problem that toggling one of the options in the
user account dialog will automatically submit the form.
The problem got introduced as a combination of the recent accessibility
fixes where some elements got turned into HTML button elements to make
them keyboard accessible. Doing that, I did not realize that the default
type of a button is `submit` [1]. This causes no problems at most places,
but will cause problem within a form (e.g. the user account settings)
where toggling an option is now identical to clicking submit.
This patch fixes the issue by setting the `type` attribute to `button`.
Not only for the toggle switch, but also for a few other elements which
have been recently converted to buttons.
[1] https://www.w3.org/TR/2011/WD-html5-20110525/the-button-element.html#attr-button-type
This patch should fix most of the problems for users trying to access
the user settings via screen reader. It makes sure user interface
elements can be reached via keyboard and provides proper labels, roles
and values so you not only can interact with elements but also know what
you are actually changing.
While not focused on other views, this should also already fix a number
of accessibility issues with other settings pages.
