Update issue templates

Author: ViTeXFTW

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,25 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Subject of the issue
+Describe your issue here.
+
+### Your environment
+* version of angular-translate
+* version of angular
+* which browser and its version
+
+### Steps to reproduce
+Tell us how to reproduce your issue
+
+### Expected behaviour
+Tell us what should happen
+
+### Actual behaviour
+Tell us what happens instead