Shortening a toolbar button label

Shortening a toolbar button label: Is there a way to shorten toolbar button labels? For example "Messages" to "Msg" ?

This is possible with

text P[Messages] "Msg"

Optionally, use an icon with tooltip, e.g.

text P[Messages] "@AL\QMessages@"

Or short text plus tooltip, no icon:

text P[Messages] "@ \QMessages@Msg"

Or icon with short text and tooltip:

text P[Messages] "@AL\QMessages@Msg"