Take a look at the following list[1] of 200 translations from our Dutch--Afrikaans translator and,

1) Fix the translation, e.g. put the correct translation on a line under the machine translation

2) Catalogue frequent errors. For example, an error in word choice, a mistake in structural transfer, a disambiguation problem.

3) If you know how, fix the problem in the translator, if not, talk to your mentor who will guide you through it.

1. https://apertium.svn.sourceforge.net/svnroot/apertium/incubator/apertium-af-nl/dev/test-corpus.txt