Issue #3475979 by m4olivei, rkoller, finnsky: Remove prefixed abbreviations...

Issue #3475979 by m4olivei, rkoller, finnsky: Remove prefixed abbreviations from top-level menu items

core/modules/navigation/components/toolbar-button/toolbar-button.css

@@ -107,7 +107,7 @@
 }
 [class*="toolbar-button--icon"]:not(:has(.toolbar-button__icon))::before {
   flex-shrink: 0;
-  content: attr(data-icon-text);
+  content: attr(data-icon-text) / "";
   text-align: center;
   color: currentColor;
   font-size: calc(0.75 * var(--admin-toolbar-rem));

core/modules/navigation/components/toolbar-button/toolbar-button.pcss.css

@@ -119,7 +119,7 @@
 [class*="toolbar-button--icon"]:not(:has(.toolbar-button__icon)) {
   &::before {
     flex-shrink: 0;
-    content: attr(data-icon-text);
+    content: attr(data-icon-text) / "";
     text-align: center;
     color: currentColor;
     font-size: calc(0.75 * var(--admin-toolbar-rem));

core/scripts/css/compile.js

@@ -33,6 +33,7 @@ module.exports = (filePath, callback) => {
           'has-pseudo-class': false,
           'image-set-function': false,
           'prefers-color-scheme-query': false,
+          'content-alt-text': false,
         }
       }),
       postcssPixelsToRem({