Clarify "merge into branch" dialog for simple mode

The message is currently:
"
Changes from the feature/branch2_createdbyr2 branch will be added in your workspace.
Do not forget to share them with your co-workers by committing and pushing them in the master branch.
"
In simple mode we don't need to commit and push for availability, it is automatic. Thus new message will be:
"
Changes from the feature/branch2_createdbyr2 branch will be merged into your current branch master.
Note that your co-workers can see the content of your current branch.
"