Fix typo

src/invidious/views/playlist.ecr

@@ -35,7 +35,7 @@
 <div class="pure-g h-box">
     <div class="pure-u-1 pure-u-md-1-5">
     <% if page >= 2 %>
-        <a href="/playlist?list=<%= playlist.id %>&page=<%= page - 1 %>">Next page</a>
+        <a href="/playlist?list=<%= playlist.id %>&page=<%= page - 1 %>">Previous page</a>
     <% end %>
     </div>
     <div class="pure-u-1 pure-u-md-3-5"></div>