diff --git a/core/.stylelintrc.json b/core/.stylelintrc.json
index 832748d..c1d3cfa 100644
--- a/core/.stylelintrc.json
+++ b/core/.stylelintrc.json
@@ -17,7 +17,7 @@
     "function-comma-space-after": null,
     "function-linear-gradient-no-nonstandard-direction": null,
     "function-name-case": null,
-    "function-whitespace-after": null,
+    "function-whitespace-after": ["always"],
     "length-zero-no-unit": null,
     "no-empty-source": null,
     "no-unknown-animations": true,
diff --git a/core/modules/ckeditor/css/plugins/language/ckeditor.language.css b/core/modules/ckeditor/css/plugins/language/ckeditor.language.css
index feea125..7970f48 100644
--- a/core/modules/ckeditor/css/plugins/language/ckeditor.language.css
+++ b/core/modules/ckeditor/css/plugins/language/ckeditor.language.css
@@ -13,7 +13,7 @@ html [lang] {
   outline: 1px dotted gray;
 }
 html [lang]:after {
-  content: " ("attr(lang)")";
+  content: " ("attr(lang) ")";
   font-size: 10px;
   color: #666;
 }
diff --git a/core/themes/stable/css/ckeditor/plugins/language/ckeditor.language.css b/core/themes/stable/css/ckeditor/plugins/language/ckeditor.language.css
index feea125..7970f48 100644
--- a/core/themes/stable/css/ckeditor/plugins/language/ckeditor.language.css
+++ b/core/themes/stable/css/ckeditor/plugins/language/ckeditor.language.css
@@ -13,7 +13,7 @@ html [lang] {
   outline: 1px dotted gray;
 }
 html [lang]:after {
-  content: " ("attr(lang)")";
+  content: " ("attr(lang) ")";
   font-size: 10px;
   color: #666;
 }