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[GUI] Latitude is not the best term for linear region of the curve#20911

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victoryforce wants to merge 1 commit intodarktable-org:masterfrom
victoryforce:linear-region-instead-of-latitude
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[GUI] Latitude is not the best term for linear region of the curve#20911
victoryforce wants to merge 1 commit intodarktable-org:masterfrom
victoryforce:linear-region-instead-of-latitude

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Sorry, I should have checked what effect the changes in #20880 would have. The change seemed so trivial that I didn't. But the problem is that changing the parameter name in dt_bauhaus_slider_from_params breaks the introspective connection of this widget with the corresponding parameter. :-(

So, first of all, this PR fixes the introduced breakage. But the problem remains that the word "latitude" has primarily a geographical meaning. Accordingly, in translations there can be terms that have only this meaning. In fact, this is the case at least in the Czech translation, where the translation "zeměpisná šírka" literally means "geographic latitude". So the current Czech translation of the slider in Filmic RGB looks extremely surprising.

I started to research whether "latitude" is really a common term for the linear part of a curve. I didn't find anything like that, it seems more like it's a name invented by the module author. The only thing that comes to mind when the word latitude is used in a photographic context is "exposure latitude"which is a completely different concept and is another reason why "latitude" in the context of a curve is a poor name choice.

This PR changes the name of the slider from "latitude" to "linear region" which is a common term, short enough for a label in the GUI and completely self-explanatory without having to guess the meaning.

@TurboGit TurboGit added this to the 5.6 milestone May 3, 2026
@TurboGit TurboGit added the scope: translation / strings make darktable international label May 3, 2026
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