Extract the languages available in the XLSForm, and provide a dropdown for the user to select

[spwoodcock]

• Currently the user must provide a language string, e.g. english(en) before converting the XLSForm.
• This is prone to typos / misremembering / etc - ideally the user can select from options.
• This would mean loading the form in advance before the processing algo runs though!

We could extract all available translations easily:

XLSFormConverter/xlsformconverter/XLSFormConverter.py

Lines 170 to 177 in e4f212e

	fields = self.survey_layer.fields().names()
	if fields[0] == "Field1":
	self.survey_skip_first = True
	fields = self.survey_layer.getFeature(1).attributes()
	self.survey_type_index = fields.index("type") if "type" in fields else -1
	self.survey_name_index = fields.index("name") if "name" in fields else -1
	self.survey_label_index = fields.index("label") if "label" in fields else -1

# translation fields must have `::` between 'label' and the translation alias
translation_tags = sorted({f.split("::", 1)[1] for f in fields if "::" in f})

then display them in a dropdown for selection.

[nirvn]

@spwoodcock , a bit more on this: the available QGIS parameters that are shipped out of the box would not allow us do this (they have no awareness of any XLSForm context :) ).

However, because the QGIS bindnigs are such a fantastic framework, there's a way to implement this via custom parameter. It's a bit involved, but if this is something that'd be prioritized down the road, it's doable! :)