remove text animation from BottomBar so more text fits in the labels

For many languages, there are unavoidable long words needed for the labels on the button bar, for example, the standard word for Settings can be up to 15 characters long: #1569 (comment 126469088)

The BottomBar was scaling the active one up, and sizing all the fields based on that size. This removes that animation, and sets all tabs to always have the same text size. That makes it possible to make the spacing tighter. This also sets the text truncating mode to "middle" which sticks an elipsis in the middle of the truncated word and shows the start and end.

Screenshots are here: #1569 (comment 126724411)

closes #1569 (closed) closes !756 (closed)

@licaon-kter @ldmpub @Bubu @hotlittlewhitedog @dkanada @pserwylo

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