Add modifier classes to typography in order to use these variants via class as well

frontend/src/app/spot/styles/sass/common/typography.sass

@@ -32,3 +32,20 @@
   @include spot-caption
   padding: 0
   margin: 0
+
+.spot-header-big,
+.spot-header-small,
+.spot-subheader-big,
+.spot-subheader-small,
+.spot-body-big,
+.spot-body-small,
+.spot-caption
+  &_bold
+    font-weight: bold
+
+  &_italic
+    font-style: italic
+
+  &_regular
+    font-weight: normal
+    font-style: normal