Update Terms of Use Modal and fix message flashing.

app/blueprints/main/routes.py

@@ -1,8 +1,9 @@
-from flask import flash, redirect, render_template, url_for
+from flask import abort, flash, jsonify, redirect, render_template, url_for
 from flask_login import current_user, login_required, login_user
 from app.blueprints.auth.forms import LoginForm
 from app.models import Corpus, User
 from . import bp
+from app import db
 
 
 @bp.route('/', methods=['GET', 'POST'])
@@ -72,6 +73,16 @@ def terms_of_use():
     )
 
 
+@bp.route('/accept-terms-of-use', methods=['POST'])
+@login_required
+def accept_terms_of_use():
+    current_user.terms_of_use_accepted = True
+    db.session.commit()
+
+    return jsonify('You accepted the terms of use'), 202
+
+
+
 @bp.route('/social')
 @login_required
 def social():