Rename solvers, make names unique

html/index.html

@@ -37,7 +37,7 @@
                 <form name="pwgen" id="form_id">
                     <input placeholder="Code" type="text" name="serial" id="serial_id" />
                     <br/><br/>
-                    <input type="button" class="btn primary" name="serial" id="button_id" value="Get password" />
+                    <input type="submit" class="btn primary" name="serial" id="button_id" value="Get password" />
                 </form>
                 </div>
                 <div id="result_id">