calendar: smartphone focus for monthpicker within calendar dialog (safari)

[andreaschu]

If you use the monthpicker of dialog in graphical calendar the page focus results in a zoom of the monthpicker and a 'noisy' behavior of the page.

[vdick]

temporary solution (at first only available in test_module), everything stays the same, only on Apple devices the font size is increased to 16px. The survey should be build and rolled out