Fixes issue and merge request templates for gitlab.

ISSUE_TEMPLATE.md → .gitlab/issue_templates/bug_report.md

@@ -4,9 +4,9 @@ Please directly edit it inline to provide the required information.
 
 Before submitting the issue, please confirm (by adding a X in the [ ]):
 
-- [ ] the issue has not yet been reported on [Github](https://github.com/Frama-C/Frama-C-snapshot/issues);
+- [ ] the issue has not yet been reported on [Gitlab](https://git.frama-c.com/pub/frama-c/issues);
 - [ ] the issue has not yet been reported on our [BTS](https://bts.frama-c.com);
-- [ ] you installed Frama-C as prescribed in the [instructions](https://github.com/Frama-C/Frama-C-snapshot/blob/master/INSTALL.md).
+- [ ] you installed Frama-C as prescribed in the [instructions](INSTALL.md).
 
 # Contextual information
 

PULL_REQUEST_TEMPLATE.md → .gitlab/merge_request_templates/external_contribution.md

-Thank you for submitting a pull request (PR) to the Frama-C team.
+Thank you for submitting a merge request to the Frama-C team.
 We propose the following template to ease the process.
 Please directly edit it inline to provide the required information.
 
-Before submitting the PR, please confirm (by adding a X in the [ ]):
+Before submitting the merge request, please confirm (by adding a X in the [ ]):
 
-- [ ] this pull request is linked to an issue on [Github](https://github.com/Frama-C/Frama-C-snapshot/issues) or on our [BTS](https://bts.frama-c.com);
-- [ ] you contributed to Frama-C as prescribed in the [instructions](https://github.com/Frama-C/Frama-C-snapshot/blob/master/CONTRIBUTING.md).
+- [ ] you contributed to Frama-C as prescribed in the [instructions](CONTRIBUTING.md).
 - [ ] if the size of the PR requires it, you have signed the
-  [Contributor Licensing Agreement](https://github.com/Frama-C/Frama-C-snapshot/blob/master/CLA.md)
+  [Contributor Licensing Agreement](CLA.md)