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I wonder if we need to mark these for plural translation.  CC'ing the i18n team.

So what is the exact question? Where are plurals involved here?

We have strings like this:

Catalog.GetString ("+{0} dB"), db);
Catalog.GetString ("{0} Hz"), frequencies[i]

Where we're passing in numbers -- the decibels and frequency in Hz.  I have no clue if there are languages that would need pluralization support in these cases.

To me, db and Hz are the same category as €, ＄, m (meter), ms (millisecond) or kg (kilogram), which don't have a plural.

I would in general refer to the SI-units and signs, which are dB and Hz. Anyway FYI, the russian wikipedia page contains a table with the SI and another version:

http://ru.wikipedia.org/wiki/%D0%93%D0%B5%D1%80%D1%86_%28%D0%B5%D0%B4%D0%B8%D0%BD%D0%B8%D1%86%D0%B0_%D0%B8%D0%B7%D0%BC%D0%B5%D1%80%D0%B5%D0%BD%D0%B8%D1%8F%29

(wonder if that links works in the end...)

Removing i18n from CC to void spamming the list.

As far as Polish goes, they usually aren't „pluralized”