Update the gitlab bug issue template

.gitlab/issue_templates/Bug.md

@@ -1,9 +1,42 @@
-Detailed description of the issue. Put as much information as you can, potentially
-with images showing the issue.
+# Steps to reproduce
+<!--
+    Explain in detail the steps on how the issue can be reproduced.
+-->
+1.
+2.
+3.
 
-Steps to reproduce:
+Reproducible in:
+<!--
+    Please test if the issue was already fixed in the unstable version of the app.
+    For that, follow these steps:
+    1. Make sure Flatpak is installed or install it following these steps https://flatpak.org/setup
+    2. Install the unstable version of the app following this link 
+    https://gitlab.gnome.org/GNOME/gnome-apps-nightly/raw/master/nautilus.flatpakref and save
+    it as a ".flatpakref" file
 
-1. Open Hammond
-2. Do an action
-3. ...
+    If these steps failed, write in 'Other' the distribution you’re using and
+    the version of the app.
+-->
+- Flatpak unstable: (yes or no) <!-- Write "yes" or "no" after the semicolon. -->
+- Other:
 
+# Current behavior
+<!-- Describe the current behavior. -->
+
+
+# Expected behavior
+<!-- Describe the expected behavior. -->
+
+
+# Additional information
+<!--
+    Provide more information that could be relevant.
+    
+    If the issue is a crash, provide a stack trace following the steps in:
+    https://wiki.gnome.org/Community/GettingInTouch/Bugzilla/GettingTraces
+-->
+
+
+<!-- Ignore the text under this line. -->
+/label ~"Bug"