Fix string interpolations

[mzazrivec]

String interpolations aren't allowed in a gettext string. This fix also needs to land in gaprindashvili.

Fixes #16459

[miq-bot]

Checked commit mzazrivec@0530342 with ruby 2.3.3, rubocop 0.47.1, haml-lint 0.20.0, and yamllint 1.10.0
3 files checked, 0 offenses detected
Everything looks fine. 🍪

[simaishi]

Gaprindashvili backport details:

$ git log -1
commit ff23a1c807e7e2e820e497415ffa92dc03b3acba
Author: Oleg Barenboim <chessbyte@gmail.com>
Date:   Tue Nov 14 17:09:48 2017 +0200

    Merge pull request #16468 from mzazrivec/fix_string_interpolations
    
    Fix string interpolations
    (cherry picked from commit 44c7c81839998d991f3bf25946d5c118a6fd2cb8)