Add check to Kanji Trainer.

Author: elModo7

upcoming_content.html

@@ -427,7 +427,7 @@ <h2 id="done">Done:</h2>
 							</div>
 
 							<div class="custom-control custom-checkbox">
-								<input class="custom-control-input" type="checkbox" id="doneCheckbox7">
+								<input class="custom-control-input custom-control-input-success" type="checkbox" id="doneCheckbox7" checked="">
 								<label for="doneCheckbox7" class="custom-control-label">Japanese Kanji Trainer Web</label>
 							</div>
 						</ul>