Issue templates: Add "awaiting triage" labels (#884)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve
 title: ''
-labels: bug
+labels: bug,awaiting triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest an idea to improve this project
 title: ''
-labels: feature
+labels: feature,awaiting triage
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/support_request.md

@@ -2,7 +2,7 @@
 name: Support request
 about: 'You need support related to Threema or Threema Web '
 title: '[SUPPORT]'
-labels: ''
+labels: 'contact-support'
 assignees: ''
 
 ---