add lang_header parameter for specify language header values in export#2643

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jdugh wants to merge 2 commits intokobotoolbox:mainfrom jdugh:lang_header_param

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Commits on Apr 29, 2020

add lang_header parameter. lang_header can be used for specify the language for header values in excel/csv export (you can have _xml header values and _default values for submits datas). If not set…
jdugh
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Commits on Apr 30, 2020

change arg name lang_header to header_lang and remove second fallback value for header_lang
jdugh
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