feat(train): a weight vest among the equipment (ADR 0034, D7)

A vest keeps its weight and, if adjustable, how far it goes. At a place
that has one, a set of bodyweight work offers it beside the weight, a
tap writing its weight in.

Whats-New: Add a weight vest to your equipment, and put its weight on a bodyweight set with a tap.
Whats-New-De: Trage eine Gewichtsweste bei deiner Ausrüstung ein und übernimm ihr Gewicht mit einem Tipp in einen Satz mit Körpergewicht.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/train/halkyon_train_flutter/lib/l10n/app_en.arb

@@ -1702,7 +1702,7 @@
   "placeDeleteMessage": "The place and its equipment are deleted on all your devices.",
   "placeAddEquipment": "Add equipment",
   "placeEmptyHint": "Nothing here yet. Add the equipment this place has.",
-  "equipmentKind": "{kind, select, barbell{Barbell} ezBar{EZ bar} trapBar{Trap bar} dumbbellHandle{Dumbbell handles} plates{Weight plates} fixedDumbbells{Dumbbells} kettlebells{Kettlebells} bench{Bench} rack{Rack} pullUpBar{Pull-up bar} dipBars{Dip bars} cableMachine{Cable machine} bands{Resistance bands} other{Your own}}",
+  "equipmentKind": "{kind, select, barbell{Barbell} ezBar{EZ bar} trapBar{Trap bar} dumbbellHandle{Dumbbell handles} plates{Weight plates} fixedDumbbells{Dumbbells} kettlebells{Kettlebells} weightVest{Weight vest} bench{Bench} rack{Rack} pullUpBar{Pull-up bar} dipBars{Dip bars} cableMachine{Cable machine} bands{Resistance bands} other{Your own}}",
   "@equipmentKind": {
     "placeholders": {
       "kind": {
@@ -1718,6 +1718,19 @@
   "itemDone": "Done",
   "itemRemove": "Remove",
   "itemWeightInvalid": "A weight in kilograms, above 0",
+  "weightRangeKg": "{from}–{to} kg",
+  "@weightRangeKg": {
+    "placeholders": { "from": { "type": "String" }, "to": { "type": "String" } }
+  },
+  "itemVestWeight": "Weight, or its lightest",
+  "itemVestUpTo": "Up to",
+  "itemVestUpToHint": "Only if it's adjustable",
+  "itemVestUpToInvalid": "More than its lightest weight",
+  "strengthWearVest": "{name}, {weight}",
+  "@strengthWearVest": {
+    "description": "A chip at a set of bodyweight work offering the place's weight vest: its name, and its weight or range.",
+    "placeholders": { "name": { "type": "String" }, "weight": { "type": "String" } }
+  },
   "weightKg": "{weight} kg",
   "@weightKg": {
     "placeholders": {