Update issue templates

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Name] theme"
+labels: Bug-theme
+assignees: ''
+
+---
+
+**Where is the mistake**
+
+Detailed description of the place where the error is located

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an theme for this project
+title: Make me a theme [name]
+labels: Theme-request
+assignees: ''
+
+---
+
+**For which device do you need a theme?**
+
+Smartphone or PC
+
+**Approximate theme colors**
+
+Write in detail what colors to use in the theme
+
+**Image**
+
+Write a link to the image with for the theme (without NSFW)