Move comment label button styles into theme

tildes/scss/_themes.scss

@@ -208,6 +208,26 @@ $theme-black: map-merge($theme-base, (
     }
   }
 
+  .btn-comment-label-exemplary {
+    @include labelbutton($comment-label-exemplary-color);
+  }
+
+  .btn-comment-label-joke {
+    @include labelbutton($comment-label-joke-color);
+  }
+
+  .btn-comment-label-noise {
+    @include labelbutton($comment-label-noise-color);
+  }
+
+  .btn-comment-label-offtopic {
+    @include labelbutton($comment-label-offtopic-color);
+  }
+
+  .btn-comment-label-malice {
+    @include labelbutton($comment-label-malice-color);
+  }
+
   .comment-branch-counter {
     color: $foreground-secondary;
   }
@@ -531,6 +551,20 @@ $theme-black: map-merge($theme-base, (
   }
 }
 
+@mixin labelbutton($color) {
+  color: $color;
+  border-color: $color;
+
+  &:hover {
+    color: $color;
+  }
+
+  &.btn-used:hover {
+    background-color: $color;
+    color: #fff;
+  }
+}
+
 @mixin syntax-highlighting($is-light) {
   @if ($is-light) {
     .highlight {

tildes/scss/modules/_btn.scss

@@ -68,37 +68,3 @@
     border: 1px solid;
   }
 }
-
-@mixin labelbutton($color) {
-  color: $color;
-  border-color: $color;
-
-  &:hover {
-    color: $color;
-  }
-
-  &.btn-used:hover {
-    background-color: $color;
-    color: #fff;
-  }
-}
-
-.btn-comment-label-exemplary {
-  @include labelbutton($comment-label-exemplary-color);
-}
-
-.btn-comment-label-joke {
-  @include labelbutton($comment-label-joke-color);
-}
-
-.btn-comment-label-noise {
-  @include labelbutton($comment-label-noise-color);
-}
-
-.btn-comment-label-offtopic {
-  @include labelbutton($comment-label-offtopic-color);
-}
-
-.btn-comment-label-malice {
-  @include labelbutton($comment-label-malice-color);
-}