Update issue templates

.github/ISSUE_TEMPLATE/default-issue-template.md

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+---
+name: Default issue template
+about: Default template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Related content :** Guide|Tools
+**Issue with the content :** Yes|No
+
+*Your comments here. Please read CONTRIBUTING.md before posting issues.*

.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/improvement-request.md

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+---
+name: Improvement request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+(Please read CONTRIBUTING.md before posting issues)
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**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 you've considered.
+
+**Additional context**
+Add any other context or screenshots about the improvement request here.

.github/ISSUE_TEMPLATE/submit-a-general-issue.md

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+---
+name: Submit a general issue
+about: Default template
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Related content :** Guide|Tools
+**Issue with the content :** Yes|No
+
+*Your comments here. Please read CONTRIBUTING.md before posting issues.*