Rename Distribution bar to Stacked bar

[katush]

Rename Distribution bar visualization fo aggregated categories to Stacked bar

[sgratzl]

but is is a distribution and not a pure stacking. the values among groups are not comparable, because the it is essentially a stacked histogram thus sum up to 100% = distribution

[mstreit]

a stacked bar that sums up to 100% is still a stacked bar.
the stacked bar chart type refers to the representation and does not describe what the numbers are. a pie chart, for example, is also not a distribution chart although it shows contributions to 100%.