add info on max upload size in the query interface

[kimakan]

See issue #126

[coveralls]

Pull Request Test Coverage Report for Build 3839048223

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 65.888%

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Totals
Change from base Build 3827943683:	0.0%
Covered Lines:	4599
Relevant Lines:	6980

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💛 - Coveralls

[agy-why]

After discussing with @kimakan, bytes is the angular filter, should be used only inside the query app. Otherwise prefer the filesizeformat filter from django.