diff --git a/docs/localization.md b/docs/localization.md
index 1d9c7622..57a5af9b 100644
--- a/docs/localization.md
+++ b/docs/localization.md
@@ -262,6 +262,18 @@ Getting this wrong is worse than missing a string, because it corrupts data or b
 
 - **Agent and chat output.** Whatever Claude or opencode wrote. It is content.
 - **User content** — file names, paths, terminal output, code, commit messages, note bodies.
+- **A label quoted from ANOTHER product's interface.** "Click **Enable**", "set **App name**", "choose
+  **Internal**" in a setup guide. These read like prose and are identifiers: their whole job is to match
+  what the reader will actually see on Google's screen, and Google localises by the reader's _Google_
+  account language, not by ours. Translating them sends somebody hunting for "Ativar" in a console that
+  says "Enable".
+
+  So translate the connective prose around them and leave the quoted label in English. Do not key it with
+  identical values in both catalogs either — that is a key whose two sides can never legitimately differ,
+  which is a maintenance cost bought for nothing.
+
+  Decided 2026-08-23 on `GoogleOAuthConfig.tsx`, where 55 of the file's 67 strings are of this kind.
+
 - **Identifiers that cross a boundary** — route paths, permission keys (`registry.ts`), error _codes_
   (the code is the key; its message is what gets translated), app ids, sidecar names, PM2 process
   names, database values.