Language and special character bug fixes and improvements

When typing accented characters:

• Characters are now inserted correctly using the Apple accent menu. Previously, two characters were inserted instead of one.

When typing in Korean:

• Hitting enter now ends the composition and inserts a new line. Before, users had to hit enter twice to enter a new line.
• Extra characters are no longer inserted at the beginning of an entry.

When composing characters: (e.g., Japanese)

• The first character no longer disappears.
• The cursor no longer jumps to the beginning of a line entry.
• Text no longer duplicates or submits accidentally before confirming the selection.