Update Gitlab issue templates

Refer to problem report dialog and the inspector as a source of
information and take some suggestions from !56.

.gitlab/issue_templates/New bug.md

@@ -1,36 +1,51 @@
-**Bug summary**
+**Bug Summary**
 
-(Summarise the bug encountered concisely here. Please replace all text
-in parentheses like these.)
+Provide a short summary of the bug you encountered. Please replace all
+comments such as this with the requested information.
 
-**About you**
 
- * Geary version: (x.y.z)
- * Installation method: (Package? Flathub? Source code?)
- * Your desktop: (GNOME? KDE? Something else?)
- * Your operating system and version: (Ubuntu 16.04? Fedora 28? Rolled your own?)
- * Email provider: (Gmail, Yahoo!, Outlook.com, or someone else?)
+**Your installation**
+
+To obtain installation information, copy it from Geary's Problem
+Report dialog if shown (or else open the Geary Inspector by typing
+Shift + Alt + I) by selecting System, and clicking the Copy
+button, then pasting here.
+
+ * Geary version:                    <!-- "x.y.z" -->
+ * Installation method:              <!-- Package? Flathub? Self-compiled? -->
+ * Desktop environment:              <!-- GNOME? KDE? Something else? -->
+ * Operating system and version:     <!-- Ubuntu 18.04? Fedora 29? -->
+ * Email provider:                   <!-- Gmail, Yahoo, Outlook.com, something else? -->
+
 
 **Steps to reproduce**
 
- 1. (Step one)
- 2. (Step two)
- 3. (...)
+ 1. Step one
+ 2. Step two
+ 3. ...
 
-**What is the current bug behavior?**
 
-(What actually happens)
+**What happened?**
 
-**What is the expected correct behavior?**
+What did Geary do that was unexpected?
+
+
+**What did you expect to happen?**
+
+What did you expect Geary to do?
 
-(What you see happening instead)
 
 **Relevant logs and/or screenshots**
 
-(Paste any relevant logs - please use code blocks (```) to format
-console output, logs, and code as it's very hard to read otherwise. If
-the bug is a crash, please obtain a [stack
-trace](https://wiki.gnome.org/Apps/Geary/ReportingABug#Stack_Trace)
-and attach it to this bug.)
+To obtain log information, save it from Geary's Problem Report dialog
+if shown (or else open the Geary Inspector by typing Shift + Alt + I),
+by clicking the Save As button and attaching the resulting file
+to this issue.
 
-/label ~Bug
+If the bug is a crash, please obtain a stack trace and attach it to
+this issue so it can be debugged by following the instructions on this
+page: https://wiki.gnome.org/Apps/Geary/ReportingABug#Stack_Trace
+
+
+<!-- Do not remove the following line -->
+/label ~"1. Bug"