Assorted error fixes following some work on Episode 1 story translations and Usonian Apocrypha homebrew.

• Fixed an instance where Healing Pollen incorrectly had "battle" as a requirement; The "next turn" cooldown is correct, and this Skill has no prerequisites.
• Replaced several instances of "up to twice" in traits with "May be taken twice" in order to clarify the nature of stacking traits.
• Replaced Returning Shield's description with the correct translation.
• Renamed the Nine-Tailed's "Explosion Sign" with "Fulmination Sign" to avoid collision with the generic Explosion spell, fixed a few cases where skills requiring/affecting Combustion Sign instead listed Explosion Sign.
• One of the Labyrinth of Phantasma event tables incorrectly called for a Sense (-30) Check, when the actual penalty should've been -3.
• The hint text on page 27 incorrectly stated that the Jet Dolphin replaces the user's Movement value, instead of granting Flight and a Movement bonus.
• Edited the description of Silent Turn, which previously suggested that Nightcallers should hit themselves.
• Other typo fixes.