Improve copy in mr warning messages
Coming from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3669 ### Problem / Proposal #### 1 This looks weird, can we add "into target branch [branch name]" ![Screen_Shot_2017-12-15_at_00.44.14](https://gitlab.com/gitlab-org/gitlab-ee/uploads/636f5f1ba4604c83f613c0a18c3617c0/Screen_Shot_2017-12-15_at_00.44.14.png) ![Screen_Shot_2017-12-15_at_00.56.52](https://gitlab.com/gitlab-org/gitlab-ee/uploads/375415e82ac8960185bc8be3a80d6c84/Screen_Shot_2017-12-15_at_00.56.52.png) #### 2 "please resolve these discussions" is unnecessary and we don't do the same at WIP ![Screen_Shot_2017-12-15_at_00.51.12](https://gitlab.com/gitlab-org/gitlab-ee/uploads/4e033a18136ce9403b91713ee63cf564/Screen_Shot_2017-12-15_at_00.51.12.png) ![Screen_Shot_2017-12-15_at_00.51.40](https://gitlab.com/gitlab-org/gitlab-ee/uploads/e0576a01a33740d076bb5cb927ef7a81/Screen_Shot_2017-12-15_at_00.51.40.png)
issue