Add mod documentation in seven languages

docs/en.md

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+# Test Defaults and Patches — a test fixture for property patches
+
+This mod is not content. It is a **test fixture**: a small set of property patches that the `property_patches` test loads to check that patches of other mods' characters and items merge the way the game promises. It is never part of a game and is not meant to be enabled by players.
+
+## What it patches
+
+A property patch is a file `patches/<kind>.json`. Each entry names an entity by its `Id` and lists properties to add or change; the `Id` `*` is a **wildcard** that reaches every entity of the kind. The fixture has one targeted and one wildcard patch per kind:
+
+```json
+{
+  "Items": [
+    { "Id": "Marao", "TestPatched": 42, "TestDefault": 100 },
+    { "Id": "*", "TestDefault": -20, "TestGlobalPatch": 1 }
+  ]
+}
+```
+
+```json
+{
+  "Items": [
+    { "Id": "food/ration", "Durability": 99, "SpecialProp": true },
+    { "Id": "*", "Durability": 50, "GlobalItemProp": "patched" }
+  ]
+}
+```
+
+The rules these patches check:
+
+- a **targeted** patch wins over the wildcard: Marao gets `TestDefault` 100, not -20;
+- the **wildcard** reaches every other entity: any other character gets `TestDefault` -20, every item `Durability` 50;
+- keys only one of them sets are all kept: Marao also gets `TestGlobalPatch` 1, the ration `GlobalItemProp`;
+- a targeted key never leaks to other entities;
+- the entity's own typed fields, such as the ration's name, survive the merge.
+
+## Running the test
+
+```text
+godot --path . res://scenes/menu/launcher.tscn -- --with-mods=test_defaults_and_patches --itest=property_patches
+dotnet run --project tests/Cthangover.TestRunner -- --test property_patches
+```
+
+The fixture is loaded only because `--with-mods=` names it. Its output in a real run:
+
+```text
+[PASS] Marao: targeted value: TestPatched=42
+[PASS] Marao: targeted beats wildcard: TestDefault=100
+[PASS] Marao: wildcard-only key: TestGlobalPatch=1
+[PASS] werewolf_girl_1: wildcard value: TestDefault=-20
+[PASS] werewolf_girl_1: no targeted key
+[PASS] ration: targeted beats wildcard: Durability=99
+[PASS] ration: targeted-only key: SpecialProp=true
+[PASS] ration: wildcard-only key: GlobalItemProp=patched
+[PASS] ration: typed field survives the merge
+[PASS] wolf_meat: wildcard value: Durability=50
+[TEST_RESULT] name=property_patches passed=14 failed=0
+```
+
+The test is part of the mod (`src/PropertyPatchesTest.cs`) and is active only with `--itest=property_patches`.
+
+## Why it stays out of games
+
+Its manifest says `"fixture": true`. A fixture is never part of `--all-mods` or of a game's mod set; it loads only when `--with-mods=` names it, so its patches cannot leak into other tests or into play. Enabled in a real game, it would add test properties to every character and every item of Cthangover — wildcard patches touch everything. It depends on the Cthangover mods it patches (`cthangover_game`, `cthangover_murakami`, `cooking`).
+
+The same mod is also a safe place for the tool tests to write into: the `tools_windows` test creates a scene in it through the scene editor and removes it again.