Improve project merge request settings

What does this MR do?

This is just the changes for the 2 MR settings panels.

- labels in ‘Merge request’ radio selection should be regular font weight. Explanations below the labels should be styled as ‘secondary’ text
- ‘Description parsed with GitLab Flavored Markdown.’ should be regular, not italic and styled as ‘secondary’ text
- labels in ‘Merge request’ checkboxes should be regular font weight. Explanations below the labels should be styled as ‘secondary’ text
- ‘Save changes’ buttons should be disabled until there’s a change to save

- change the ‘Approvers’ label to ‘Add approvers’
- limit the width of the ‘Approvers’ input field to input-lg (320px)
- ‘Add’ button should be the default (white) style) and disabled until there’s something to add
- ‘Approval required’ input field should be limited to input-xs (80px)
- checkbox labels should be regular font weight

Changelog entry added, if necessary
Documentation created/updated via this MR
Documentation reviewed by technical writer or follow-up review issue created
Tests added for this feature/bug
Tested in all supported browsers
Conforms to the code review guidelines
Conforms to the merge request performance guidelines
Conforms to the style guides
Conforms to the database guides
Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
EE specific content should be in the top level /ee folder
For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
Security reports checked/validated by reviewer

Edited Apr 05, 2019 by Luke Bennett

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