Checked it in FF and Chrome (the language was changed to Hebrew for the site) - there were no extra spaces displayed:

What am I missing?

Based on the example from this conversation, the problem of extra spaces added by Google Translate is also happening for the translation of "Oktay Rıfat Horozcu" from English to Spanish. Note the spaces added before the "," character in the translation that are not present in the original:

Some added spaces are added when   is present (checked in wmf.14):

Compare to Yandex translation:

And it seems that the endash was replaced with hyphen in the sample that @Pginer-WMF and that issue is supposed to be fixed by now:

In T213694#4902711, @Pginer-WMF wrote:

Based on the example from this conversation, the problem of extra spaces added by Google Translate is also happening for the translation of "Oktay Rıfat Horozcu" from English to Spanish. Note the spaces added before the "," character in the translation that are not present in the original [...]

Here is a most straightforward case - a MT Google translation en: Truism to català with several problems:

• extra space added around a simple link - In [[philosophy]], a sentence
• extra space is added in place of the template: {cn|date=June 2017}}
• a missing template is displayed in place of {{spaced ndash}}

The issue was mentioned in this comment.

Change 501031 had a related patch set uploaded (by Santhosh; owner: Santhosh):
[mediawiki/services/cxserver@master] Remove extra spaces from MT result

https://gerrit.wikimedia.org/r/501031

Change 501031 merged by jenkins-bot:
[mediawiki/services/cxserver@master] Remove extra spaces from MT result

https://gerrit.wikimedia.org/r/501031