put a column on whitelist for parsing

[ArturAntin]

hey @aloisdeniel, I really like your work with this package. I'd have one suggestion: For better comprehensibility I'd love to add a group column in the google sheet. For example to group the keys by on which page they appear in my app. Of course you can just name your key '<pageName>.<key>', nonetheless I think this would be a nice feature to just say somewhere that a specific column name should not be added as a language (same as the condition-column). Especially if you want to give the job to translate your app to someone without good it-skills it may be hard for them to read the sheet.
Thanks 😄

[aloisdeniel]

Hi ! So nice that it helped you!

The issue #27 could a first step to add comments. :)

[aloisdeniel]

Just added it in version 2.1.0.

Comment any column with (<name>) column name.