fix: make German translation more consistent + neutral (#1558)

In German you can say "Du" (=informal) or "Sie" (= formal). Before this commit both versions were used at the same time. It is preferred to make interfaces neutral, as some systems use "Du" (iOS, macOS) and some "Sie" (MS, Android). In addition all other translations were neutral, too, so this makes it more consistent.

src/translations/de.ts

@@ -13,7 +13,7 @@ const translation: Translation = {
   copy: 'Kopieren',
   currentValue: 'Aktueller Wert',
   error: 'Fehler',
-  goToSlide: (slide, count) => `Gehen Sie zu Folie ${slide} von ${count}`,
+  goToSlide: (slide, count) => `Zu Folie ${slide} von ${count} gehen`,
   hidePassword: 'Passwort verbergen',
   loading: 'Wird geladen',
   nextSlide: 'Nächste Folie',
@@ -28,7 +28,7 @@ const translation: Translation = {
   resize: 'Größe ändern',
   scrollToEnd: 'Zum Ende scrollen',
   scrollToStart: 'Zum Anfang scrollen',
-  selectAColorFromTheScreen: 'Wähle eine Farbe vom Bildschirm',
+  selectAColorFromTheScreen: 'Farbe vom Bildschirm auswählen',
   showPassword: 'Passwort anzeigen',
   slideNum: slide => `Folie ${slide}`,
   toggleColorFormat: 'Farbformat umschalten'