Also, addint a suffix to the reference text when the milestone is in another project

Using the syntax proposed in #13829 [project_reference]%(milestone_id | milestone_name)
to get a link to the referred milestone.

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

Refresh page according remaining todos

Fixes #14678 

See merge request !3428

Fix setting of "action" for Grape transactions

After wondering why we're not getting all the data in Grafana that I
wanted I realized I wasn't setting the "action" field properly here.

See merge request !3842

Wrap all code in diffs

Closes #15382  
Closes #15422  
All diff code wraps to next line instead of scrolling

<img src="/uploads/ec5754919bac0b027fcb122bb88435b3/Screen_Shot_2016-04-20_at_12.22.27_PM.png" width="500px">

See merge request !3838

[ci skip]

Add due date to issues

Closes: #12709

See merge request !3614

Merely setting the "action" tag will only result in the transaction
itself containing a value for this tag. To ensure other metrics also
contain this tag we must set the action using Transaction#action=
instead.

Articles on proper commit messages

2 Articles on commit messages

[ci skip]

See merge request !3831

Add Sentry logging for JavaScript errors

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/12675

See merge request !3795

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fixed issue with dropdown not being toggleable again

Fix typos on sorting dropdown related to due date
Remove constant array and add Structs on Issue to keep due date data to fill options

Add due_date text field to sidebar issue#show
Add ability sorting issues by due date ASC and DESC
Add ability to filtering issues by No Due Date, Any Due Date, Due to tomorrow, Due in this week options
Add handling issue due_date field for MergeRequest
Update CHANGELOG
Fix ambigous match for issues#show sidebar
Fix SCREAMING_SNAKE_CASE offenses for due date contants
Add specs for due date sorting and filtering on issues

Increased z-index of right sidebar

Fixes issue with active button overlapping it

Closes #15243

See merge request !3722

Add margin to top of form actions

Closes #15213

Also fixes other modal inputs (like add new directory, etc)  

![Screen_Shot_2016-04-20_at_1.47.14_PM](/uploads/14b474da2f86dcc3c1afd9e8ea09e812/Screen_Shot_2016-04-20_at_1.47.14_PM.png)

See merge request !3841

Mutliple label filter

Fixes #989 

See merge request !3438