EE port of 50632-combine-color-duplicates

EE port of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21375

added 69 commits

• 1de37be7...9116be1d - 68 commits from branch master
• 422a88ab - Remove jquery.scss; Combine multiple duplicate grays into global gray variables;…

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@ClemMakesApps can you review?

assigned to @ClemMakesApps

added 746 commits

• 422a88ab...9f5cec02 - 745 commits from branch master
• 648b4c21 - Remove jquery.scss; Combine multiple duplicate grays into global gray variables;…

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changed milestone to %11.3

changed milestone to %11.4

added 468 commits

• 648b4c21...4b464ffb - 467 commits from branch master
• f0c16621 - Remove jquery.scss; Combine multiple duplicate grays into global gray variables;…

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@ClemMakesApps This one should be ready now too

added 97 commits

• f0c16621...a23144ee - 96 commits from branch master
• 70231fc0 - Remove jquery.scss; Combine multiple duplicate grays into global gray variables;…

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	2 Errors
🚫	70231fc0: The commit subject may not be longer than 50 characters
🚫	70231fc0: Commits that change more than 20 lines must describe these changes in the commit body

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One or more commit messages do not meet our Git commit message standards. For more information on how to write a good commit message, take a look at How to Write a Git Commit Message.

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Reject ruby interpolation in externalized strings

When using ruby interpolation in externalized strings, they can't be
detected. Which means they will never be presented to be translated.

To mix variables into translations we need to use `sprintf`
instead.

Instead of:

    _("Hello #{subject}")

Use:

    _("Hello %{subject}) % { subject: 'world' }

This is an example of a bad commit message:

updated README.md

This commit message is bad because although it tells us that README.md is updated, it doesn't tell us why or how it was updated.

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approved this merge request

merged

mentioned in commit ac38fed1

mentioned in issue gitlab-org/release/tasks#464 (closed)

added Enterprise Edition label