Improve description of hysteresis bounds

[ArXa1L]

Hello,
I found that hysteresis value mapping works differently than stated in its documentation:

source:

    private Type mapValue(double lower, double upper, double value) {
        if (value <= lower) {
            return low;
        } else if (value >= upper) {
            return high;
        }
        return previousType;
    }

doc:

<parameter name="lower" type="text" required="true">
  <label>Lower Bound</label>
  <description>Maps to OFF if value is below lower bound (plain number or number with unit).</description>
</parameter>
<parameter name="upper" type="text">
  <label>Upper Bound</label>
  <description>Maps to ON if value is above upper bound (plain number or number with unit).</description>
</parameter>

I thought that changing the value mapping would be more correct and opened PR #4120, but during the discussion we decided that it would be preferable to improve the documentation

[seime]

In SystemProfiles_XX.properties, these texts are translated to 15-20 languages. These are not adjusted accordingly, but it might be hard for the contributor to do so.

[J-N-K]

Please remove these translations (only keep the XML changes and the English) and add it later using crowdin. Otherwise it'll not show up there.

[J-N-K]

LGTM, thanks!