The corner crack is typical of brick expansion on long walls which don't have a movement joint. It won't get any worse now, and nothing to worry about.
As Tony has posted looks like an expansion problem.
In general terms there should be a correctly formed expansion joint every so often, about 6 meters or so, get this dimension wrong and well cracks form elsewhere.
In effect if there is no expansion joint @ about 6.M then the wall without the expansion will actually cause a crack in the wall that is at right angles to the original wall without the expansion gap.
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