Added en_CA locale

modules/system.nix

@@ -13,6 +13,14 @@
     ];
   };
 
+  # Locales
+  i18n.supportedLocales = [
+    "C.UTF-8/UTF-8"
+    "en_CA.UTF-8/UTF-8"
+    "en_US.UTF-8/UTF-8"
+    "fr_CA.UTF-8/UTF-8"
+  ];
+
   # Enable CUPS to print documents.
   services.printing.enable = true;