[FIX] web: base.css: fallback for browsers without calc support

see https://developer.mozilla.org/en-US/docs/Web/CSS/calc
[FIX] base: translate place holders in partner view

Placeholders for City, ZIP and State were not translated
Fixes #4340 (and one of #1755), opw 616589
[FIX] survey: use ustr instead of str for question.question