Compel Tongue, Mass

Enchantment (Compulsion) [mind-affecting]
Level: Bard * 4, Cleric */Oracle * 5, Druid * 5, Hunter * 5, Sorcerer */Wizard * 5, Warlock * 5
Components: V, S, M (a wooden block carved with a letter)
Casting Time: 1 Standard Action
Range: touch
Target: one creature/level, no two of which can be more than 30 ft. apart
Duration: 1 hour/level (D)
Saving Throw: Will negates
Spell Resistance: yes
  You can share your facility for one particular language with other creaturse. For 24 hours the targets can read, understand, and communicate to the best of their ability in any one language which you already know. For the spell's entire duration, the targets can speak and write only in the language imparted, but their ability to understand other languages is unaffected. A target must have the physical capacity to articulate sounds, make gestures, or engage in whatever other method speakers of the language use to communicate with each other in order to actually converse. If a target lacks the mental capacity to grasp an actual language it still gains enough knowledge to respond to and carry out even extremely complex commands or suggestions coached in the language (whether written or spoken). However, since this spell does not endow a target with greater reasoning capacity, merely a temporarily enhanced vocabulary, a person offering up instructions to non-sentient creatures must take care to remove any ambiguity or guesswork.
  Similarly, this spell does not affect the basic nature of a target, or its disposition toward you or anyone else, so convincing it to actually carry out these instructions could require negotiation, threats, or outright bribery.
  The same language restriction applies to all creatures, and the same language must be imparted to all creatures affected by the same casting of this spell.