Fixed issue #8160: queXML export: ambigous variable names in text/number/dual matrix question

Dev: Variable names are now built as:
Dev: [questioncode]_[y-scale code]_[x-scale code].
Dev: Varnames are thus compatible with VV-export,
Dev: Stata-XML and so on and so forth, which facilitates
Dev: easy merging of data collected with quexf and LS
Dev: quexfPDF: change default length of short text

Dev: 25 fits on letter but not A4
Dev: quexfPDF: change default length of short text

Dev: 25 fits on letter but not A4
Dev: make A4 paper size standard

Dev: A4 is already set as standard in other places
Dev: e.g. pdf.php, statistics_helper.php
Fixed issue #8271: quexf-pdf export: "Section" is not translated
Merge branch '2.05' of https://github.com/LimeSurvey/LimeSurvey into 2.05
Dev: typo #8271
Dev Fixed issue where vendorspecific SQL was used.
Fixed #8272: Cannot export token fields to spreadsheet
New translation: Armenian
New translation: Fula
New translation: Kinyarwanda
New translation: Dari
New translation: Pashto
Dev Fixed missing array keys.
New translation: Gujarati by Parag Agarwal
New translation: Marathi by Parag Agarwal
New translation: Georgian
Updated feature: min/max date fields - codes/expressions should be entered without curly braces

Dev: question codes or expressions had to
Dev: be entered with curly braces in min/max
Dev: date fields, which confused EM. Now,
Dev: min/max dates (yyyy-mm-dd), question codes,
Dev: expressions should alle be entered w/o braces.
Dev: Will update wiki accordingly