polish translation needs to be updated

Some of the strings are not translated

settings, "sharing" and "advanced" tabs contains not translated strings
in "message log" section, "basic" and "advanced" tab names are not translated
"bandwidth graph" section, "Recv" and "Sent" not translated on the graph
translation of some strings in "graph" section, in hide-able settings panel, could be better ("Opaque" and "Always on top" translations)
in main window, the "Setup relaying" translation has "\n" appended

Trac:
Username: sebb

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