translatable default message

When no message is given in the chat syntax, the default is now taken
from the language file.

add send button

Some people said they're not clear how to send messages, so a button was
added. Pressing Enter still works. The entry was changed to a textarea
making longer questions easier. Shift-

add send button

Some people said they're not clear how to send messages, so a button was
added. Pressing Enter still works. The entry was changed to a textarea
making longer questions easier. Shift-Enter can be used to add line
breaks. All button titles are now translatable.

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german translation and more styling adjustments