since we've eliminated #block_code

and the methods that relied on them

the <pre><code> wrapping is *always* used by the helper, and *never* by
anywhere else, so pull the wrapping into the helper

Fix import_data being saved as a result of an invalid import_url

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/19479

Seem that in all cases the `import_url` was an empty string. The `import_url` is now validated correctly and no longer creates the `import_data`even if it fails validation. <= Should cover cases 1, 3, and 4 of https://gitlab.com/gitlab-org/gitlab-ce/issues/19479#note_13005276

Also, it now rescues from all exceptions when importing from a URL, so we make sure the `import_status` is failed after that. Covers case 2 of https://gitlab.com/gitlab-org/gitlab-ce/issues/19479#note_13005276

See merge request !5206

Cleanup feature proposal template

## What does this MR do?

Changes the recommended template for feature proposals.

## Are there points in the code the reviewer needs to double check?

## Why was this MR needed?

I've been using the template for a while, and find that putting so many words into the h2 makes me think there's actual content there, until I realize I'm just reading the template text (again). I think we can get away with just putting `Description` as the header, and putting the suggested content for that section as plain text below for someone to replace.

## What are the relevant issue numbers?

## Screenshots (if relevant)

![image](/uploads/20a99c98a12aad84c1a7ec020f365b2f/image.png)

/cc @JobV 

See merge request !5240

Use default cursor for table header of project files

## What does this MR do?

Use default cursor for table header of project files.

## Are there points in the code the reviewer needs to double check?

Nope.

## Why was this MR needed?

The table header had a pointer cursor even though it was not clickable.

## What are the relevant issue numbers?

fixes #19612


See merge request !5165

Added shortcut to focus filters

## What does this MR do?

Adds shortcut `f` to focus filter inputs.

## Are there points in the code the reviewer needs to double check?

Is this a valid implementation?

Please check [this comment below](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/4570#note_12359978)!

## Why was this MR needed?

Keyboard ninja UX ⚔ 

## What are the relevant issue numbers?

Closes #18120.

## Screenshots (if relevant)

![Screen_Shot_2016-06-09_at_18.34.56](/uploads/d4cfb6ec340c118f5227be3f16ffbed1/Screen_Shot_2016-06-09_at_18.34.56.png)

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- [ ] Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4763

Aria labels on top header links

## What does this MR do?

Added `aria-label` to the links in top header bar for accessibility.

## What are the relevant issue numbers?

Closes #12797 


See merge request !5205