Show confirmation dialog before reevaluation

Author: fushar

cms/server/admin/templates/macro/reevaluation_buttons.html

@@ -35,7 +35,7 @@
 {% elif contest_id is not none %}
   {% set invalidate_arguments = {"contest_id": contest_id} %}
 {% endif %}
-<button onclick="cmsrpc_request(
+<button onclick="confirm('Do you really want to reevaluate?') && cmsrpc_request(
                  'EvaluationService', 0,
                  'invalidate_submission', {
 {% for key, value in invalidate_arguments.items() %}
@@ -48,7 +48,7 @@
         disabled
 {% endif %}
         title="Compilation" >C</button>
-<button onclick="cmsrpc_request(
+<button onclick="confirm('Do you really want to reevaluate?') && cmsrpc_request(
                  'EvaluationService', 0,
                  'invalidate_submission', {
 {% for key, value in invalidate_arguments.items() %}
@@ -61,7 +61,7 @@
         disabled
 {% endif %}
         title="Evaluation" >E</button>
-<button onclick="cmsrpc_request(
+<button onclick="confirm('Do you really want to reevaluate?') && cmsrpc_request(
                  'ScoringService', 0,
                  'invalidate_submission', {
 {% for key, value in invalidate_arguments.items() %}