Send highlighted word in segment to concordance search or synonym search

Add 2 short-cuts that do the following:

• Send to concordance search (short-cut F3)
• Send to synonym search (only available, if synonym search is available) (ALT+F3)

When context menu option is selected, the word in question is send to the corresponding search and the tab of the search is shown.

In addition, the first time a word of more than 4 characters is selected in a segment in a newly opened task, a toast message appears:

EN: Press F3 to send the highlighted word to the concoredance search. And ALT+F3 to the synonym search.

DE: Drücken Sie F3, um das markierte Wort an die Konkordanzsuche zu senden. Und ALT+F3 für die Synonymsuche.

The part of the message for the synonym search is only present, if the synonym search is present.