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 issue is.
+
+## To Reproduce
+Provide a link to a live example, or an unambiguous set of steps to reproduce this issue. Include configuration, logs, etc. to reproduce, if relevant.
+
+1.
+2.
+3.
+4.
+
+## Expected behavior
+A clear and concise description of what you expected to happen.
+
+## Screenshots
+If applicable, add screenshots to help explain your problem.
+
+## Your Environment
+Include as many relevant details about the environment you experienced the problem in
+
+* Icinga Web 2 version and modules (System - About):
+* Web browser used:
+* Icinga 2 version used (`icinga2 --version`):
+* PHP version used (`php --version`):
+* Server operating system and version:
+
+## Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Is your feature request related to a problem? Please describe.
+A clear and concise description of what the problem is. Ex. I'm always using this feature but am missing [...]
+
+## Describe the solution you'd like
+A clear and concise description of what you want to happen. 
+
+## Describe alternatives you've considered
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+Add any other context or screenshots about the feature request here.