Description of problem:
The TM shows previous translations for a particular string, not only the most recent translation. Neither the English string nor the translation that is shown in the TM actually exist in Zanata anymore, they have both since been updated. Yet, they are presented as TM results. 

How reproducible:
always

Steps to Reproduce:
see next comment (private) with links

Actual results:
The current and previous versions of a matching string are shown in the TM results. Moreover, the previous version is shown higher up than the current version.

Expected results:
Only the current version of a matching string should be shown. 


Additional info:
Strings get updated for a reason, e.g. correcting a mistake in the translation. There is no benefit of showing those previous translations in the TM, it only opens a door to reusing wrong translations.