refactor: use english for routes, parameters and internal messages

templates/board/plan/_desk.html.twig

@@ -13,7 +13,7 @@
     'desk-07': { x:  40, y: 260 }, 'desk-08': { x: 200, y: 260 }, 'desk-09': { x: 360, y: 260 },
     'desk-10': { x:  40, y: 360 }, 'desk-11': { x: 200, y: 360 }, 'desk-12': { x: 360, y: 360 }
 } %}
-{% set time_params = selected_time.allDay ? {} : { von: selected_time.start, bis: selected_time.end } %}
+{% set time_params = selected_time.allDay ? {} : { from: selected_time.start, to: selected_time.end } %}
 
 <svg viewBox="0 0 520 460" class="w-full h-auto" role="img" aria-label="Raumplan Büro">
     <rect x="10" y="20" width="500" height="420" rx="8" class="fill-white stroke-gray-300" stroke-width="2"></rect>

templates/board/plan/_parking.html.twig

@@ -8,7 +8,7 @@
     'parking-01': { x:  40, y:  60 }, 'parking-02': { x:  40, y: 130 }, 'parking-03': { x:  40, y: 200 },
     'parking-04': { x: 280, y:  60 }, 'parking-05': { x: 280, y: 130 }, 'parking-06': { x: 280, y: 200 }
 } %}
-{% set time_params = selected_time.allDay ? {} : { von: selected_time.start, bis: selected_time.end } %}
+{% set time_params = selected_time.allDay ? {} : { from: selected_time.start, to: selected_time.end } %}
 
 <svg viewBox="0 0 520 300" class="w-full h-auto" role="img" aria-label="Parkplatz">
     <rect x="10" y="20" width="500" height="260" rx="8" class="fill-white stroke-gray-300" stroke-width="2"></rect>

templates/board/plan/_spot.html.twig

@@ -1,6 +1,6 @@
 {#
     The shared shape a plan is drawn from. Imported by each board/plan/_<type>.html.twig, so the
-    per-type partials carry geometry only and free/belegt/deine looks identical everywhere.
+    per-type partials carry geometry only and free/taken/yours looks identical everywhere.
 
     Clicking always opens a modal: the create modal when free, the edit modal when it is yours
     (which is where changing the times and releasing live). Nothing else is clickable, so the SVG