Fixes #13141: Add a max-width: 100%; to label elements so IE8 wraps text

dist/css/bootstrap-rtl.css

@@ -2976,6 +2976,7 @@ legend {
 
 label {
   display: inline-block;
+  max-width: 100%;
   margin-bottom: 5px;
   font-weight: bold;
 }

dist/css/bootstrap.css

@@ -2285,6 +2285,7 @@ legend {
 }
 label {
   display: inline-block;
+  max-width: 100%;
   margin-bottom: 5px;
   font-weight: bold;
 }

less/forms.less

@@ -31,6 +31,7 @@ legend {
 
 label {
   display: inline-block;
+  max-width: 100%; // Force IE8 to wrap long content (see #13141)
   margin-bottom: 5px;
   font-weight: bold;
 }