Mini-break end sound is too loud/disturbing by default

[Chealer]

By default, Stretchly 1.17.2 plays a sound at the end of breaks. This is very useful to notice the end of a break, mostly for long breaks.

For mini-breaks, a sound is still useful, but a lot less. Moreover, it plays more often, so it is more disturbing, in particular when played on speakers not only heard by the user, as is often the case in offices. I consider that the Crystal glass sound played by default is needlessly long/loud for mini-breaks.

Workrave uses micro-break end sounds which are more discrete than Stretchly's and its own rest break end sounds, in particular with Classic and Subtle themes. I recommend that Stretchly either uses a mini-break end sound different from the rest break end sound by default, or plays it at a considerably lower volume.