reduce retries of tests to prevent running into 1h timeout. Fix "new document" button text in Nextcloud taiko test

Closes: #1049

Fixes: #969

Weirdly, going directly from Calendar to Files fails, taiko displays
no files. So we need to take an extra roundtrip via the Dashboard *sigh*

See https://open.greenhost.net/openappstack/openappstack/-/jobs/107990

Fixes: #897

Fixes: #854