Show definition in translate5's editor term portlet in language corresponding to the term

In the term portlet in the right column of translate5's editor terms that exist in the segment are listed and in addition those that belong to the same termEntry in either the source or the target language.

Implement, that for each term the definition is shown in a tooltip, that corresponds to the same language as the term. If no definition for that language exists, show the definition on termEntry-level, if this exists. An info icon points to the existence of the definition.