Add exit hint after Basic Movement Training

Easier back jumps in Basic Movement Training (fixes bug #692) The explanation of Back Jumping (2/2) has been simplified and the "hard" part has been made easier by lowering the girders. The original idea was that I wanted to force players to learn how to jump higher by delaying the 2nd backspace keypress. But this turned out that this section was too unfair and we have lost at least one player due to rage-quitting, according to feedback.

update hashes changed in r79e13080b9db (critical sprites) ra675a94b5cc1 (critical scripts)

Update hedgewars_en.ts

Update German translation

Update translation files

Fix SetAmmoTexts not working in stats-only mode