Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Describe the desired functionality and relevant acceptance criteria
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Beschreibung des Features**
+Kurze Beschreibung
+
+**Akzeptanzkriterien**
+- [ ] Acceptance Criteria 1
+- [ ] Acceptance Criteria 2
+- [ ] Acceptance Criteria 3
+
+**optional: Screenshots**