diff --git a/docs/i18n-keymap.md b/docs/i18n-keymap.md
index 3b22679..9c5becf 100644
--- a/docs/i18n-keymap.md
+++ b/docs/i18n-keymap.md
@@ -9,11 +9,10 @@ It maps existing text keys only (no feature expansion) and stays aligned with `s
 
 ## Key families
 
-- `frontend.ui.host.*` — host-facing gameplay actions and status text.
-- `frontend.ui.player.*` — player-facing gameplay actions and status text.
-- `frontend.ui.common.*` — shared labels used across host/player views.
-- `frontend.errors.*` — user-facing error keys shown by frontend.
-- `backend.error_codes.*` / `contract.backend_to_frontend_error_keys.*` — backend code → frontend key bridge.
+- `host` — `frontend.ui.host.*` host-facing gameplay actions and status text.
+- `player` — `frontend.ui.player.*` player-facing gameplay actions and status text.
+- `system` — shared UI labels used across host/player views (implemented under `frontend.ui.common.*` in `shared/i18n/lobby.json`).
+- `errors` — user-facing error keys shown by frontend (`frontend.errors.*`) plus backend code → frontend key bridge via `backend.error_codes.*` / `contract.backend_to_frontend_error_keys.*`.
 
 ## Gameplay flow key map
 
@@ -21,7 +20,7 @@ It maps existing text keys only (no feature expansion) and stays aligned with `s
 |---|---|---|---|---|
 | Lobby | `frontend.ui.host` | `host.title` | Host gameplay flow | Vært gameplay-flow |
 | Lobby | `frontend.ui.player` | `player.title` | Player gameplay flow | Spiller gameplay-flow |
-| Lobby | `frontend.ui.common` | `common.session_code` | Session code | Sessionskode |
+| Lobby | `system` (`frontend.ui.common`) | `common.session_code` | Session code | Sessionskode |
 | Lobby | `frontend.ui.player` | `player.nickname` | Nickname | Kaldenavn |
 | Join | `frontend.ui.player` | `player.join` | Join | Join |
 | Start round | `frontend.ui.host` | `host.start_round` | Start round | Start runde |
@@ -34,7 +33,7 @@ It maps existing text keys only (no feature expansion) and stays aligned with `s
 | Scoreboard | `frontend.ui.host` | `host.load_scoreboard` | Load scoreboard | Hent scoreboard |
 | Scoreboard | `frontend.ui.host` | `host.final_leaderboard` | Final leaderboard | Finale leaderboard |
 | Scoreboard | `frontend.ui.player` | `player.final_leaderboard` | Final leaderboard | Finale leaderboard |
-| Scoreboard | `frontend.ui.common` | `common.points_short` | pts | point |
+| Scoreboard | `system` (`frontend.ui.common`) | `common.points_short` | pts | point |
 
 ## Frontend error keys used in flow scope
 
@@ -52,6 +51,8 @@ It maps existing text keys only (no feature expansion) and stays aligned with `s
 
 Mapped in `contract.backend_to_frontend_error_keys` (source: `shared/i18n/lobby.json`):
 
+> Note: `host_only_action` is **not** part of the current shared contract mapping and is intentionally not listed here.
+
 - `session_code_required` → `session_code_required`
 - `nickname_invalid` → `nickname_invalid`
 - `session_not_found` → `session_not_found`
@@ -61,7 +62,6 @@ Mapped in `contract.backend_to_frontend_error_keys` (source: `shared/i18n/lobby.
 - `category_not_found` → `start_round_failed`
 - `round_start_invalid_phase` → `start_round_failed`
 - `round_already_configured` → `start_round_failed`
-- `host_only_action` → `start_round_failed`
 
 ## Notes