fix: add missing data-th selector for tables

Author: Daniel Ruf

app/design/frontend/Magento/blank/Magento_Checkout/web/css/source/module/_cart.less

@@ -305,7 +305,7 @@
                     white-space: nowrap;
                     width: 33%;
 
-                    &:before {
+                    &[data-th]:before {
                         content: attr(data-th) ':';
                         display: block;
                         font-weight: @font-weight__bold;

app/design/frontend/Magento/blank/web/css/source/_extends.less

@@ -846,7 +846,7 @@
                     white-space: nowrap;
                     width: 33%;
 
-                    &:before {
+                    &[data-th]:before {
                         content: attr(data-th) ':';
                         display: block;
                         font-weight: @font-weight__bold;

app/design/frontend/Magento/luma/Magento_Checkout/web/css/source/module/_cart.less

@@ -460,7 +460,7 @@
                     white-space: nowrap;
                     width: 33%;
 
-                    &:before {
+                    &[data-th]:before {
                         content: attr(data-th);
                         display: block;
                         font-weight: @font-weight__semibold;

app/design/frontend/Magento/luma/Magento_Sales/web/css/source/_module.less

@@ -482,7 +482,7 @@
 
         .options-label + .item-options-container,
         .item-options-container + .item-options-container {
-            &:before {
+            &[data-th]:before {
                 content: attr(data-th) ':';
                 display: block;
                 font-weight: @font-weight__bold;

app/design/frontend/Magento/luma/web/css/source/_extends.less

@@ -760,7 +760,7 @@
                     white-space: nowrap;
                     width: 33%;
 
-                    &:before {
+                    &[data-th]:before {
                         content: attr(data-th) ':';
                         display: block;
                         font-weight: @font-weight__bold;