Improve translation of issue templates

.gitlab/issue_templates/Bug.md

@@ -1,8 +1,10 @@
-### Concerned version
+### Environment
 
-Version: %X.X.X
+LemonLDAP::NG version: (version number)
 
-Platform: (Nginx/Apache/Node.js)
+Operating system: (distribution and version)
+
+Web server: (Nginx/Apache/Node.js/...)
 
 ### Summary
 
@@ -11,7 +13,7 @@ Summarize the bug encountered concisely
 ### Logs
 
 ```
-Set here the logs using debug mode if possible. Attach it as file if it's too big
+Include the logs using logLevel = debug if possible. Attach it as file if it's too big
 ```
 
 ### Backends used

.gitlab/issue_templates/NewFeature.md

@@ -1,7 +1,8 @@
 ### Summary
 
-Summarize the new feature encountered concisely
+Summarize the proposed new feature concisely
 
 ### Design proposition
 
-Describe here the process imaginated (interface design suggest, proposed process,…)
+Detail your proposed implementation (interface design, architecture, impact on
+current behavior,…)