Fixes #12868: Enables icon feedback on validation states for large/small inputs.

Also reorders the CSS to place Glyhpicons as a dependency before other components for fewer overrides and less specific CSS.

less/bootstrap.less

@@ -2,9 +2,10 @@
 @import "variables.less";
 @import "mixins.less";
 
-// Reset
+// Reset and dependencies
 @import "normalize.less";
 @import "print.less";
+@import "glyphicons.less";
 
 // Core CSS
 @import "scaffolding.less";
@@ -17,7 +18,6 @@
 
 // Components
 @import "component-animations.less";
-@import "glyphicons.less";
 @import "dropdowns.less";
 @import "button-groups.less";
 @import "input-groups.less";