update assets from bootstrap@3.3.7

assets/less/bootstrap/mixins/hide-text.less

@@ -1,3 +1,5 @@
+// stylelint-disable font-family-name-quotes, font-family-no-missing-generic-family-keyword
+
 // CSS image replacement
 //
 // Heads up! v3 launched with only `.hide-text()`, but per our pattern for
@@ -8,7 +10,7 @@
 
 // Deprecated as of v3.0.1 (has been removed in v4)
 .hide-text() {
-  font: ~'0/0' a;
+  font: ~"0/0" a;
   color: transparent;
   text-shadow: none;
   background-color: transparent;