Update issue templates

.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 frustrated when [...]
+
+**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.

.github/ISSUE_TEMPLATE/issue-report.md

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+---
+name: Issue report
+about: Report a problem
+title: ''
+labels: 'T: Bug'
+assignees: ''
+
+---
+
+<!--
+Before submitting an issue, make sure that :
+* Make sure you're running the latest Tabby version: https://github.com/Eugeny/tabby/releases
+* You've searched the existing issues: https://github.com/Eugeny/tabby/issues
+
+*Reports are accepted in English ONLY.*
+-->
+
+**Describe the problem**:
+[A clear and concise description of what the bug is.]
+
+**To Reproduce**:
+[Steps to reproduce the behavior]