Update icon font css rules (#2250)

app/assets/stylesheets/fonts/openproject_icon_font.css.sass

@@ -157,7 +157,7 @@
 .icon-cancel:before
   content: "\e005"
 
-dt.changeset:before,
+dt > .icon-changeset:before,
 .icon-changeset:before
   content: "\e006"
 
@@ -191,7 +191,7 @@ dt.changeset:before,
 .icon-not-watch:before
   content: "\e00f"
 
-dt.news:before,
+dt > .icon-news:before,
 .icon-news:before
   content: "\e010"
 
@@ -225,14 +225,14 @@ dt.news:before,
 .icon-priority:before
   content: "\e01a"
 
-dt.project:before,
+dt > .icon-project:before,
 .icon-projects:before
   content: "\e01b"
 
 .icon-publish:before
   content: "\e01c"
 
-dt.message:before,
+dt > .icon-message:before,
 .icon-quote:before
   content: "\e01d"
 
@@ -261,7 +261,7 @@ dt > .icon-work_package-note:before,
 .icon-ticket-note:before
   content: "\e024"
 
-dt > .icon-time_entry:before,
+dt > .icon-time-entry:before,
 .icon-time:before
   content: "\e025"
 
@@ -319,7 +319,7 @@ dt > .icon-time_entry:before,
 .icon-attention1:before
   content: "\e038"
 
-dt.attachment:before,
+dt > .icon-attachment:before,
 .icon-attachment:before
   content: "\e039"
 
@@ -365,7 +365,7 @@ dt.attachment:before,
 .icon-bubble2:before
   content: "\e047"
 
-dt.reply:before,
+dt > .icon-reply:before,
 .icon-bubble3:before
   content: "\e048"
 
@@ -757,7 +757,7 @@ dt.reply:before,
 .icon-wiki2:before
   content: "\e027"
 
-dt.wiki-page:before,
+dt > .icon-wiki-page:before,
 .icon-wiki-edit:before
   content: "\e0c9"