fix: remove unexpected translations on code blocks

.github/workflows/rbe.yml

@@ -3,7 +3,8 @@ on: [push, pull_request]
 
 env:
   # Update the language picker in index.hbs to link new languages.
-  LANGUAGES: ja zh es
+  LANGUAGES: ja zh es ko
+  MDBOOK_VERSION: 0.5.1
 
 jobs:
   test:
@@ -27,12 +28,12 @@ jobs:
     - name: Install mdbook
       run: |
         mkdir bin
-        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v0.4.51/mdbook-v0.4.51-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
+        curl -sSL https://github.com/rust-lang/mdBook/releases/download/v${MDBOOK_VERSION}/mdbook-v${MDBOOK_VERSION}-x86_64-unknown-linux-gnu.tar.gz | tar -xz --directory=bin
         echo "$(pwd)/bin" >> ${GITHUB_PATH}
 
     - name: Install mdbook-i18n-helpers
       run: |
-        cargo install mdbook-i18n-helpers --locked --version 0.3.4
+        cargo install mdbook-i18n-helpers --locked --version 0.4.0
 
     - name: Report versions
       run: |

CONTRIBUTING.md

@@ -56,8 +56,7 @@ $ mdbook build
 **The following warnings can be ignored safely.**
 
 ```text
-[WARN] (mdbook::preprocess::cmd): The command wasn't found, is the "gettext" preprocessor installed?
-[WARN] (mdbook::preprocess::cmd):   Command: mdbook-gettext
+ WARN The command `mdbook-gettext` for preprocessor `gettext` was not found, but is marked as optional.
 ```
 
 [install Rust]: http://rust-lang.org/install.html

README.md

@@ -27,8 +27,7 @@ read all content offline, however!
 **The following warnings can be ignored safely.**
 
 ```text
-[WARN] (mdbook::preprocess::cmd): The command wasn't found, is the "gettext" preprocessor installed?
-[WARN] (mdbook::preprocess::cmd):   Command: mdbook-gettext
+ WARN The command `mdbook-gettext` for preprocessor `gettext` was not found, but is marked as optional.
 ```
 
 ### Using translated version

TRANSLATING.md

@@ -61,7 +61,7 @@ MDBOOK_BOOK__LANGUAGE=xx mdbook serve
 
 ### Add a language entry
 
-Please add a language entry in `.github/workflows/rbe.yml`, `theme/index.hbs`, and `src/bootstrap/src/core/build_steps/doc.rs` in [rust-lang/rust](https://github.com/rust-lang/rust) like below:
+Please add a language entry in `.github/workflows/rbe.yml`, `theme/head.hbs`, and `src/bootstrap/src/core/build_steps/doc.rs` in [rust-lang/rust](https://github.com/rust-lang/rust) like below:
 
 * `rbe.yml`
 
@@ -71,7 +71,7 @@ env:
   LANGUAGES: xx yy zz
 ```
 
-* `index.hbs`
+* `head.hbs`
 
 ```html
 <ul id="language-list" class="theme-popup" aria-label="Languages" role="menu">

book.toml

@@ -17,7 +17,9 @@ hash-files = true
 additional-css = [
   "theme/css/language-picker.css",
 ]
-additional-js = ["theme/js/language-picker.js"]
+
+[output.html.search]
+use-boolean-and = true
 
 [rust]
 edition = "2021"