Use correct labels in issue templates

.github/ISSUE_TEMPLATE/1-bug.md

@@ -1,7 +1,7 @@
 ---
 name: 🐞 Bug report
 about: Report a bug or some unexpected behavior.
-labels: bug
+labels: Bug
 ---
 <!--
 

.github/ISSUE_TEMPLATE/2-feature.md

@@ -1,7 +1,7 @@
 ---
 name: 💡 Suggestion
 about: "Suggest a new feature or an improvement. ⚠ Note: suggestions have low priority, I will answer them only if possible."
-labels: feature
+labels: Enhancement
 ---
 <!--
 

.github/ISSUE_TEMPLATE/3-help.md

@@ -1,7 +1,7 @@
 ---
 name: 📝 Help request
 about: "Ask a question about the plugin. ⚠ Note: help requests have low priority, I will answer them only if possible."
-labels: help
+labels: Help
 ---
 <!--
 

.github/ISSUE_TEMPLATE/4-documentation.md

@@ -1,7 +1,7 @@
 ---
 name: 📚 Documentation improvement
 about: "Request an improvement for the official documention."
-labels: documentation
+labels: Documentation
 ---
 ### Description
 <!-- Describe what should be improved (and if possible, how) -->