Waypoint calc page needs adaption to new functions

[Lineflyer]

Since 2022.05.02-RC (and the next production version) we are using a revised waypoint calculator, which also interworks with cache-wide variables (https://manual.cgeo.org/en/cachevariables).

The following needs to be done:

• Update screenshots on https://manual.cgeo.org/en/waypointcalculator
• Update screenshot for starting WP calc on https://manual.cgeo.org/en/coordinatedialog (and check texts and links)
• Change content of https://manual.cgeo.org/en/waypointcalculator to fit the new functionality
• Check link and anchors from https://manual.cgeo.org/en/cachevariables to https://manual.cgeo.org/en/waypointcalculator
• Translate to German

[murggel]

change content of https://manual.cgeo.org/en/notecoords "Using Personal Notes to create and store waypoint information" to fit the new syntax