Add support for meta in CSV importer

[subins2000]

What I'm doing right now is put JSON in notes

-,അ,"അകം(1) അന്തരംഗം, മനസ്സ്‌",malayalam,"{""native"": ""അകം1 അന്തരംഗം മനസ്സ്‌"", ""en"": ""akam1 antharamgam manass‌"", ""ipa"": ""əkəm1 ən̪t̪əɾəmgəm mən̪əss"", ""iso"": ""akaṁ antaraṁgaṁ manass ""}",,,1-1,,

and then use Rails to put it as JSON into meta:

Entry.find_each do |entry|
  entry.update!(meta: JSON.parse(entry.notes))
rescue
  print("error #{entry.id}")
end

Better if dictpress does this directly