Fixed links splitting across line mid-word (#151)

`break-all` meant that links would split mid-word e.g. I observed `email` become `e\nmail`. `break-word` avoids this but also ensures long links still break before overflowing the line length.

src/app/molecules/message/Message.scss

@@ -160,7 +160,7 @@
   }
 
   & a {
-    word-break: break-all;
+    word-break: break-word;
   }
   &-edited {
     color: var(--tc-surface-low);
@@ -409,4 +409,4 @@
       border-bottom-width: 0px !important;
     }
   }
-}
+}