The bug has been opened on: https://launchpad.net/ubuntu/+source/rhythmbox/+bug/87868

"Binary package hint: rhythmbox

In Preferences, under the general tab there is a combobox which sets the toolbar label position.
But "Testo sotto le icone" put the labels beside icons - not below. "Testo accanto alle icone" put the labels under the icons.

Let's give a look at: po/it.po - 130 -> 144
#: ../data/glade/general-prefs.glade.h:4
msgid ""
"Default\n"
"-\n"
"Text below icons\n"
"Text beside icons\n"
"Icons only\n"
"Text only"
msgstr ""
"Predefinito\n"
"-\n"
"Testo accanto alle icone\n"
"Testo sotto le icone\n"
"Solo icone\n"
"Solo testo"
##

..this is wrong.
Here's a patch (hey, I'm new to diff, if this is not what you want, feel free to tell me how to do a good one =)

federico@Time:~/test/rhythmbox-0.9.8/po$ diff it.po it.po.correct
141d140
< "Testo accanto alle icone\n"
142a142
> "Testo accanto alle icone\n"

Hope this is enough to correct this bug.
...
Sorry - I realize my english is not so good as you (and me, too) might want. I need more practice =)
Now, back to the bug. I do like to have "text beside icons" in toolbars, so I used the "Text position" combobox in rhythmbox preferences window. So i noticed a mistake in the italian translation: "text beside icons" ("testo affianco alle icone") was swapped with "text below icons" ("testo sotto le icone"). When using the first one, text was under the icons, while it should have been beside them; when using "testo sotto le icone" (which stands for "text below icons") text was beside them. That is:

Italian translation English Wrong behaviour
Testo sotto le icone Text below icons Text beside icons
Testo affianco allle icone Text beside icons Text below icons

This bug is limited to the italian translation of rhythmbox, though. Thank you for the tip about rosetta, feisty et al; I will file a bug/send a patch there. Bye!"