License fields not populated when using web ide
### Summary
Some licenses, and perhaps other templates, support prefilling fields like `[year]` and `[fullname]`. When using the old file template interface these work, but in the web ide they do not.
### Steps to reproduce
1. In the web IDE create a `LICENSE` and use the **MIT license** template
### What is the current *bug* behavior?
The license created looks like:
```
MIT License
Copyright (c) [year] [fullname]
Permission is hereby granted, free of charge, to any person obtaining a copy
...
```
### What is the expected *correct* behavior?
```
MIT License
Copyright (c) 2018 James Ramsay
Permission is hereby granted, free of charge, to any person obtaining a copy
...
```
### Output of checks
This bug happens on GitLab.com
### Links / references
https://gitlab.com/gitlab-org/gitlab-ce/issues/47947
issue