Merge branch 'disable_spellcheck_for_username_field' into 'master'

Disable spellcheck and autocorrect for username field in admin page

closes #14855

## before
![Screen_Shot_2016-04-19_at_9.25.12_AM](/uploads/19387c4a11a879e9034a2179e932436e/Screen_Shot_2016-04-19_at_9.25.12_AM.png)

## after
![Screen_Shot_2016-04-19_at_9.25.47_AM](/uploads/60f4eba6a97201333dc64e46d625aac2/Screen_Shot_2016-04-19_at_9.25.47_AM.png)

See merge request !3730

CHANGELOG

@@ -91,6 +91,7 @@ v 8.7.0 (unreleased)
   - Diff design updates (colors, button styles, etc)
   - Copying and pasting a diff no longer pastes the line numbers or +/-
   - Add null check to formData when updating profile content to fix Firefox bug
+  - Disable spellcheck and autocorrect for username field in admin page
   - Delete tags using Rugged for performance reasons (Robert Schilling)
   - Add Slack notifications when Wiki is edited (Sebastian Klier)
   - Diffs load at the correct point when linking from from number

app/views/admin/users/_form.html.haml

@@ -7,17 +7,17 @@
       .form-group
         = f.label :name, class: 'control-label'
         .col-sm-10
-          = f.text_field :name, required: true, autocomplete: "off", class: 'form-control'
+          = f.text_field :name, required: true, autocomplete: 'off', class: 'form-control'
           %span.help-inline * required
       .form-group
         = f.label :username, class: 'control-label'
         .col-sm-10
-          = f.text_field :username, required: true, autocomplete: "off", class: 'form-control'
+          = f.text_field :username, required: true, autocomplete: 'off', autocorrect: 'off', autocapitalize: 'off', spellcheck: false, class: 'form-control'
           %span.help-inline * required
       .form-group
         = f.label :email, class: 'control-label'
         .col-sm-10
-          = f.text_field :email, required: true, autocomplete: "off", class: 'form-control'
+          = f.text_field :email, required: true, autocomplete: 'off', class: 'form-control'
           %span.help-inline * required
 
     - if @user.new_record?