Pseudo translation is a feature that automatically generates translations that emulates the target language. Pseudo translations are not real strings and most often they are complete gibberish. However pseudo translations use the same characters as the real translations and they also emulate the average length of the translations in the specific language. This will help you to test how your user interface works on target language before you actually do any translations. Pseudo translations can also be use to visual find hard coded strings.
You can turn pseudo translations on by selecting a column and choosing Column | Fill Pseudo Translation. You can remove generated pseudo translations by selecting the column and choosing Column | Remove Pseudo Translation.