Article CSV: fix #47 and #46

[twothreenine]

• rearrange CSV columns as I suggested in Improve understandability of article upload/download spreadsheet format #47
• add locales for column headings according to my suggestions in Improve understandability of article form (labels, locales, tooltips) #50 (to do: adjust terms across menus -- post-merge?)
• update documentation of CSV layout (Article upload: Update example of spreadsheet layout #46)

TO DO:
#83, #81 (more important)
#80, #82 (less important)
any adaptations for rearranged tables necessary which I've overlooked? (for example sync feature)

[coveralls]

Pull Request Test Coverage Report for Build 10108625566

Details

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 104 unchanged lines in 9 files lost coverage.
• Overall coverage decreased (-1.2%) to 43.296%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/lib/foodsoft_file.rb	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
app/helpers/articles_helper.rb	2	55.56%
lib/article_units_lib.rb	4	57.43%
app/models/article_version.rb	6	73.56%
app/models/article_category.rb	6	50.0%
app/models/article.rb	9	45.95%
app/lib/spreadsheet_file.rb	11	21.43%
app/lib/foodsoft_file.rb	15	15.79%
app/models/supplier.rb	22	40.82%
app/controllers/articles_controller.rb	29	26.58%

Totals
Change from base Build 10108552298:	-1.2%
Covered Lines:	2974
Relevant Lines:	6869

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💛 - Coveralls