templates: update header and description and add label

Author: fpistm

.github/ISSUE_TEMPLATE/feature-request-improvement.md

@@ -1,22 +1,26 @@
 ---
-name: Feature request/improvement
+name: "⭐ Feature request/improvement"
 about: Suggest an idea or improvement for this project
 title: ''
-labels: ''
+labels: 'enhancement'
 assignees: ''
 
 ---
 
 **Is your feature request/improvement related to a problem? Please describe.**
-A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+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 or features you've considered.
 
 **Additional context**
+
 Add any other context, example or screenshots about the feature request here.
 
 Any contribution is welcome, so do not hesitate to submit a PR.