Adding a critical alias

css/font-awesome.css

@@ -2258,6 +2258,7 @@
   content: "\f2cc";
 }
 .fa-bathtub:before,
+.fa-s15:before,
 .fa-bath:before {
   content: "\f2cd";
 }

less/icons.less

@@ -766,5 +766,6 @@
 .@{fa-css-prefix}-thermometer-empty:before { content: @fa-var-thermometer-empty; }
 .@{fa-css-prefix}-shower:before { content: @fa-var-shower; }
 .@{fa-css-prefix}-bathtub:before,
+.@{fa-css-prefix}-s15:before,
 .@{fa-css-prefix}-bath:before { content: @fa-var-bath; }
 .@{fa-css-prefix}-podcast:before { content: @fa-var-podcast; }

less/variables.less

@@ -560,6 +560,7 @@
 @fa-var-rub: "\f158";
 @fa-var-ruble: "\f158";
 @fa-var-rupee: "\f156";
+@fa-var-s15: "\f2cd";
 @fa-var-safari: "\f267";
 @fa-var-save: "\f0c7";
 @fa-var-scissors: "\f0c4";

scss/_icons.scss

@@ -766,5 +766,6 @@
 .#{$fa-css-prefix}-thermometer-empty:before { content: $fa-var-thermometer-empty; }
 .#{$fa-css-prefix}-shower:before { content: $fa-var-shower; }
 .#{$fa-css-prefix}-bathtub:before,
+.#{$fa-css-prefix}-s15:before,
 .#{$fa-css-prefix}-bath:before { content: $fa-var-bath; }
 .#{$fa-css-prefix}-podcast:before { content: $fa-var-podcast; }

scss/_variables.scss

@@ -560,6 +560,7 @@ $fa-var-rss-square: "\f143";
 $fa-var-rub: "\f158";
 $fa-var-ruble: "\f158";
 $fa-var-rupee: "\f156";
+$fa-var-s15: "\f2cd";
 $fa-var-safari: "\f267";
 $fa-var-save: "\f0c7";
 $fa-var-scissors: "\f0c4";

src/icons.yml

@@ -6407,6 +6407,7 @@ icons:
     created:    4.7
     aliases:
       - bathtub
+      - s15
     categories:
       - Web Application Icons