Dear Javier,
after some quick research it looks that your claims are incorrect as
based on wrong assumptions.
Translations are updated on a regular basis, current state of
yast-base's es.po in git:
"POT-Creation-Date: 2019-07-02 02:29+0000\n" - updated yesterday
"PO-Revision-Date: 2019-05-14 23:54+0000\n" - updated less than 2 months ago
"Unagreed" translations were not pushed by some evil uncalled
translator, it was automated change, here is the diff in question:
https://github.com/yast/yast-translations/commit/9fb14085f66a48c7f7f5fca6afb...
It was done 2017-12-22 by SLE Merge Robot