I *think* I've set up the language groups appropriately. All told, there are 25 different languages between you guys; not counting Common or First Speech. Eris was the only one who took First Speech, but it's kind of an obscure language, so I decided to bundle it with Sienna's Fairy language. Please let me know if there are any errors. :P

[Language unknown: K thi ekllst Shent!]
[Language unknown: O to artovewer Ourtiowil!]
[Language unknown: Nd ul hertedrat Ameticund!]
[Language unknown: Nd ers ameredugh Ncndie!]
[Language unknown: N il necein Oneughous!]
[Language unknown: Ec il miosme Comconera!]
[Language unknown: Ev fopa thuconher Ilecas!]
[Language unknown: N ai aswhlo Ofeeechi!]
[Language unknown: P ore ilhowh Conerameness!]
[Language unknown: St ithna thelesort Roinil!]
[Language unknown: In und ratvenich Stiderhas!]
[Language unknown: Korni ithsheate!]
[Language unknown: Na pa entatisti Ecterewhe!]
[Language unknown: E th urentiout Ca!]
[Language unknown: O ei usname Whistrome St!]
[Language unknown: Is endi ssompl Nitral!]
[Language unknown: M ekom omssec Atihissom!]
[Language unknown: Ti ol ughiouove Llhi-hohari!]
[Language unknown: P olas annoek Mapo'teen!]
[Language unknown: T nc ithivesta Linoerman!]
[Language unknown: Ad ckon rievli Hipral!]
[Language unknown: Re te salipo Isckei!]
[Language unknown: Pa ious urplit Siadieev!]
[Language unknown: A ec saacse Enalof!]
[Language unknown: Ic se celo ieadplpr as whihastersta, fo moee n ss utes larovered ich wasyinprethe om utthou he, at untra men ce ononar weitll.]

Just a reminder:

Tongues Curse
At 10th level, you can understand any spoken language, as if under the effects of tongues, even during combat.

Noted! Sienna should be able to read all of these now.

I've never used language groups before, how exactly am I meant to use them? If I want to say something in, for example, dwarven, do I click on dwarven in the private line tab labeled "private to group" or just "the language group"? Is there any difference?

It's my first time using them, too. When posting, use the language group option. That way everyone can see it, but those not in the group will see gibberish. You can also put words in {curly brackets} and those won't be scrambled. I'm not sure the difference between the private to group or secret to group options, but if you use either of those it won't be visible to those without the language.

Like everything else on rpol, you can also type out the codes manually.