Fix #4189: long source: link not wrapping on tag changes report, and underscores shown as spaces

* Use underscores instead of spaces for tags in inline tag lists (upload
  tags report, tooltips, modqueue, comments page).

* Allow long tags to word wrap. Fixes long sources not wrapping in the
  uploads tag report. Also fixes very long tags that don't have
  underscores not wrapping in the sidebar (ex: kuouzumiaiginsusutakeizumonokamimeichoujin_mika).

app/javascript/src/styles/common/tags.scss.erb

@@ -40,6 +40,10 @@
   background-color: red;
 }
 
+a.search-tag {
+  word-break: break-word;
+}
+
 .inline-tag-list {
   ul {
     display: inline;