Charset templates

Hello

i have altered the templates for "failed encryption"/"successful
encryption" to use german umlauts in the messages.

We have done this by altering

Content-Type: text/plain
Content-Transfer-Encoding: 7bit

to

Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

I wonder if this has any drawbacks or if this could/should be the
default for all non ASCII languages?

Many Thanks

Andreas