fix(region): only display 'Install additional languages' if gnome-language-selector is available

Cargo.lock

@@ -1730,6 +1730,7 @@ dependencies = [
  "udev",
  "upower_dbus",
  "url",
+ "which",
  "xkb-data",
  "xkeysym",
  "zbus 5.13.2",
@@ -2398,6 +2399,12 @@ dependencies = [
  "syn 2.0.114",
 ]
 
+[[package]]
+name = "env_home"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7f84e12ccf0a7ddc17a6c41c93326024c42920d7ee630d04950e6926645c0fe"
+
 [[package]]
 name = "equator"
 version = "0.4.2"
@@ -8424,6 +8431,17 @@ dependencies = [
  "web-sys",
 ]
 
+[[package]]
+name = "which"
+version = "8.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3fabb953106c3c8eea8306e4393700d7657561cb43122571b172bbfb7c7ba1d"
+dependencies = [
+ "env_home",
+ "rustix 1.1.3",
+ "winsafe",
+]
+
 [[package]]
 name = "widestring"
 version = "1.2.1"
@@ -9072,6 +9090,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "winsafe"
+version = "0.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d135d17ab770252ad95e9a872d365cf3090e3be864a34ab46f48555993efc904"
+
 [[package]]
 name = "wit-bindgen"
 version = "0.46.0"