Update Bootstrap and FontAwesome

Author: sagikazarmark

assets/_sass/bootstrap/vendor/_alert.scss

@@ -5,7 +5,7 @@
 .alert {
   padding: $alert-padding;
   margin-bottom: $spacer-y;
-  border: 1px solid transparent;
+  border: $alert-border-width solid transparent;
   @include border-radius($alert-border-radius);
 
   // Improve alignment and spacing of inner content
@@ -20,7 +20,6 @@
 
 // Headings for larger alerts
 .alert-heading {
-  margin-top: 0;
   // Specified to prevent conflicts of changing $headings-color
   color: inherit;
 }
@@ -62,5 +61,5 @@
   @include alert-variant($alert-warning-bg, $alert-warning-border, $alert-warning-text);
 }
 .alert-danger {
-  @include alert-variant($alert-danger-bg, $alert-danger-border,$alert-danger-text);
+  @include alert-variant($alert-danger-bg, $alert-danger-border, $alert-danger-text);
 }

assets/_sass/bootstrap/vendor/_breadcrumb.scss

@@ -4,16 +4,16 @@
   list-style: none;
   background-color: $breadcrumb-bg;
   @include border-radius($border-radius);
+  @include clearfix;
 
   > li {
-    display: inline-block;
+    float: left;
 
-    + li:before {
-      $nbsp: "\00a0";
+    + li::before {
       padding-right: .5rem;
       padding-left: .5rem;
       color: $breadcrumb-divider-color;
-      content: "#{$breadcrumb-divider}#{$nbsp}"; // Unicode space added since inline-block means non-collapsing white-space
+      content: "#{$breadcrumb-divider}";
     }
   }
 

assets/_sass/bootstrap/vendor/_button-group.scss

@@ -27,7 +27,7 @@
   .btn + .btn-group,
   .btn-group + .btn,
   .btn-group + .btn-group {
-    margin-left: -1px;
+    margin-left: -$input-btn-border-width;
   }
 }
 
@@ -167,7 +167,7 @@
   > .btn + .btn-group,
   > .btn-group + .btn,
   > .btn-group + .btn-group {
-    margin-top: -1px;
+    margin-top: -$input-btn-border-width;
     margin-left: 0;
   }
 }

assets/_sass/bootstrap/vendor/_buttons.scss

@@ -8,10 +8,9 @@
   text-align: center;
   white-space: nowrap;
   vertical-align: middle;
-  touch-action: manipulation;
   cursor: pointer;
   user-select: none;
-  border: $border-width solid transparent;
+  border: $input-btn-border-width solid transparent;
   @include button-size($btn-padding-y, $btn-padding-x, $font-size-base, $line-height, $btn-border-radius);
   @include transition(all .2s ease-in-out);
 
@@ -39,16 +38,15 @@
   }
 
   &.disabled,
-  &:disabled,
-  fieldset[disabled] & {
+  &:disabled {
     cursor: $cursor-disabled;
     opacity: .65;
     @include box-shadow(none);
   }
 }
 
 // Future-proof disabling of clicks on `<a>` elements
-a.btn.disaabled,
+a.btn.disabled,
 fieldset[disabled] a.btn {
   pointer-events: none;
 }
@@ -111,8 +109,7 @@ fieldset[disabled] a.btn {
   &,
   &:active,
   &.active,
-  &:disabled,
-  fieldset[disabled] & {
+  &:disabled {
     background-color: transparent;
     @include box-shadow(none);
   }
@@ -129,8 +126,7 @@ fieldset[disabled] a.btn {
     text-decoration: $link-hover-decoration;
     background-color: transparent;
   }
-  &:disabled,
-  fieldset[disabled] & {
+  &:disabled {
     @include hover-focus {
       color: $btn-link-disabled-color;
       text-decoration: none;