[FS#25] Bug change emails should be less verbose

[LEDE Bugs]

The following task has a new comment added:

FS#25 - Bug change emails should be less verbose
User who did this - Jonas Gorski (jogo)

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It seems adding attachments to tickets still cause the subject to be changed, see http://lists.infradead.org/pipermail/lede-bugs/2016-July/000171.html for the "offending" message.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=25#comment137