Add .glyphicon-* aliases for other ISO 4217-ish currency codes

Fixes #15617.

dist/css/bootstrap.css

@@ -958,12 +958,24 @@ th {
 .glyphicon-bitcoin:before {
   content: "\e227";
 }
+.glyphicon-btc:before {
+  content: "\e227";
+}
+.glyphicon-xbt:before {
+  content: "\e227";
+}
 .glyphicon-yen:before {
   content: "\00a5";
 }
+.glyphicon-jpy:before {
+  content: "\00a5";
+}
 .glyphicon-ruble:before {
   content: "\20bd";
 }
+.glyphicon-rub:before {
+  content: "\20bd";
+}
 .glyphicon-scale:before {
   content: "\e230";
 }

docs/_data/glyphicons.yml

@@ -227,8 +227,12 @@
 - glyphicon-piggy-bank
 - glyphicon-scissors
 - glyphicon-bitcoin
+- glyphicon-btc
+- glyphicon-xbt
 - glyphicon-yen
+- glyphicon-jpy
 - glyphicon-ruble
+- glyphicon-rub
 - glyphicon-scale
 - glyphicon-ice-lolly
 - glyphicon-ice-lolly-tasted

less/glyphicons.less

@@ -266,8 +266,12 @@
 .glyphicon-piggy-bank             { &:before { content: "\e225"; } }
 .glyphicon-scissors               { &:before { content: "\e226"; } }
 .glyphicon-bitcoin                { &:before { content: "\e227"; } }
+.glyphicon-btc                    { &:before { content: "\e227"; } }
+.glyphicon-xbt                    { &:before { content: "\e227"; } }
 .glyphicon-yen                    { &:before { content: "\00a5"; } }
+.glyphicon-jpy                    { &:before { content: "\00a5"; } }
 .glyphicon-ruble                  { &:before { content: "\20bd"; } }
+.glyphicon-rub                    { &:before { content: "\20bd"; } }
 .glyphicon-scale                  { &:before { content: "\e230"; } }
 .glyphicon-ice-lolly              { &:before { content: "\e231"; } }
 .glyphicon-ice-lolly-tasted       { &:before { content: "\e232"; } }