GreekLower defines a chart for the lower-case Greek letters only.
Clicking on a button with the left mouse button inserts the character
into the current insertion target.

ArmenianBoth illustrates a more complex chart definition.
It defines a chart that covers both the upper- and lower-case
Armenian letters. Clicking the left mouse button over a button
inserts the first alternative for that button. Clicking the right
mouse button inserts the second alternative. The two alternatives
are separated by a colon in the definition.
Thus, in the first entry:

\u0561:\u0531|ayb

the pipe separates the characters from the gloss:

\u0561:\u0531 | ayb

while the colon separates the first alternative, \u0561,
from the second, \u0531:

\u0561 : \u0531
