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: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. Linux, Windows]
+ - Architecture (32 or 64 bit)
+ - Desktop type / Window Manager (KDE, Xfce, Cinnamon, MATE etc)
+ - Thunderbird version and arch (Tb xx.xx.x, 32 or 64 bit)
+ - Run `echo $XDG_SESSION_TYPE` in a terminal and report the results
+ - Add-on version
+ - App version
+ - Install type: github repository build, script installer, OBS repository.  
+ - Used Qt library (default system repository, other OBS repo, self-compiled, Qt online installer)
+
+**Additional context**
+Add any other context about the problem here.