text truncation for sidebar database connection tabs

[eug3nix]

With longer connection names (or with larger fonts) it is impossible to tell apart two db connections which names begin with the same characters.
On this screenshot the servers are named postgres-server1 and postgres-server2:

What we could try is to add ellipsis to the middle of the text to keep the end of it visible if it gets truncated:
https://jsfiddle.net/93ymy3oL/