[dudul]

Not just the Swedes, the same saying exists in France.

[jacquesm]

And Dutch:

Spreken is zilver, zwijgen is goud.

German:

Reden ist Silber, Schweigen ist Gold.

And probably many other languages besides. Proverbs are usually not limited to a single language though they may change subtly in translation.

[seba_dos1]

Polish: Mowa jest srebrem, a milczenie złotem.

[jaclaz]

Italian: Il silenzio è d'oro, la parola d'argento.

[holstvoogd]

and Holland too