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I am using a graduated legend, using the default format "%1 - %2". The numbers are formatted using decimal points, like "1.1 - 1.2".
How could I change this to using decimal commas, like "1,1 - 1,2"?
I tried the suggestion below, changing the locale to Dutch (interface language still American English. That does change the format of the values, but not the legend (see screenshot), which is what I need.
The following is a bit of a kludge, but it can be done in map layouts, and avoids mucking around with locale settings.
In the layer properties, keep the legend format as %1 - %2.
In the legend definition on your layout, edit the expression for the layer in the legend (the curly E button in the icons at the bottom when you have the layer entry selected; not the individual graduated children but the whole layer; and also not the 2nd E at the far bottom right which relates to filtering). Replace @symbol_label with replace( @symbol_label,'.',',').
This works by post-processing the string generated by the %1 - %2 and doing a string replace of decimal point by comma. You could get much fancier if you needed to by changing the legend format to some format easier to re-parse into its constituents and then extracting those constituents and formating it in a more sophisticated way using full expression syntax in the layout label expression, if you needed to. I have used this, for instance, to show graduated levels both in (native) metres as well as converted to feet.
QString::arg or something similar. This only allows simple replacement of numbered arguments %1, '%2', etc. What you are proposing would replace that with full access to QGIS' Expression logic, and would not be trivial -- though would definitely open up interesting possibilities!
The behaviour of QGIS is defined inside project definition: QGIS can either use completely system setting of your computer or override it (entirely or partly - as you like).
You can manage the behaviour of QGIS inside the opened QGIS project by clicking Settings/Options. In the search mask fill in locale (as shown in the screenshot):
I'm using an english interface, but as a locale german notations for data, money and floats.
