Fix typos in translations placeholders

[leakingoxide]

This is a PR for #7134.

I'm not entirely sure this fixes the problem that was described, because I wasn't able to get the error shown on the screen, but had to check JS console instead. Nevertheless, I'm pretty sure these typos should be corrected.

Also, I'm not sure if the .mo files should be included in the PR as well?

[codecov-io]

Codecov Report

Merging #7161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7161   +/-   ##
=======================================
  Coverage   64.63%   64.63%           
=======================================
  Files         422      422           
  Lines       20607    20607           
  Branches     2253     2253           
=======================================
  Hits        13320    13320           
  Misses       7165     7165           
  Partials      122      122

---

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[codecov-io]

Codecov Report

Merging #7161 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7161   +/-   ##
=======================================
  Coverage   64.63%   64.63%           
=======================================
  Files         422      422           
  Lines       20607    20607           
  Branches     2253     2253           
=======================================
  Hits        13320    13320           
  Misses       7165     7165           
  Partials      122      122

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 36a6fad...9044629. Read the comment docs.