From comments in code review (r77100):

+ 'mwe-upwiz-api-error-http' => 'There a problem connecting to the service.', ?Unable to connect to the service.

+ 'mwe-upwiz-api-error-ok-but-empty' => 'The server didn\'t return any information about the upload.',

MediaWiki style doesn't use contractions. Does this mean we didn't get any reply from the server?

+ 'mwe-upwiz-api-error-unknown-code' => 'The server returned an error we did not understand: "$1"',

?Unknown error

Is $1 a error code or explanation (in English?)

+ 'mwe-upwiz-api-error-uploaddisabled' => 'Uploading is disabled on this wiki.',

?Uploading of files

+ 'mwe-upwiz-api-error-nomodule' => 'The wiki did not know how to handle this upload.',

How to handle the file format or something else? The user should know what he can do, or nothing if that is the case.

+ 'mwe-upwiz-api-error-mustbeposted' => 'There\'s a bug in this software; it\'s not using the proper HTTP method.',

Again, what can the user do in this unlikely situation?

+ 'mwe-upwiz-api-error-badaccess-groups' => 'You aren\'t permitted to upload files to this wiki. Check what access groups you belong to.',

Would be nice to fetch this information for the user. I haven't seen term access group used anywhere else.

+ 'mwe-upwiz-api-error-stashfailed' => 'The wiki could not store the file.',

Temporarily or always?

+ 'mwe-upwiz-api-error-missingparam' => 'The upload didn\'t have all the required information (probably a bug in this uploader.)',

Should it print also the param to aid in bug reporting? Is it possible to automatically log these cases to somewhere?

+ 'mwe-upwiz-api-error-invalid-session-key' => 'The server couldn\'t find that file in your uploaded files.',

Which file? We have quite standard wording for session errors in MediaWiki itself.

+ 'mwe-upwiz-api-error-copyuploaddisabled' => 'Uploads by copying are disabled.',

Should try to say more clearly what Upload by copy is. Is it the same thing as upload from url?

+ 'mwe-upwiz-api-error-mustbeloggedin' => 'You are not properly logged in.',

properly? is there some kind of middle state?

+ 'mwe-upwiz-api-error-file-too-large' => 'The file you submitted was too large.',

Can this be catched before upload? Are the limits shown anywhere?

+ 'mwe-upwiz-api-error-filetype-banned' => 'This type of file is banned.',

?Files of this type cannot be uploaded?

+ 'mwe-upwiz-api-error-illegal-filename' => 'The filename is not allowed.',

Does the user after seeing this error have any idea how to fix it?

+ 'mwe-upwiz-api-error-overwrite' => 'Overwriting an existing file is not allowed.',

Is this true? I think some users can do that. Also, in quick reading of the API code, I did not find place where this error could be detected.

+ 'mwe-upwiz-api-error-badtoken' => 'The "token" we use to identify you to the server was bad.',

"token"? Is it a real token or not?

+ 'mwe-upwiz-api-warning-duplicate' => 'There is another file already on the wiki with the same content',

Can we provide the filename(s) too?

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Version: unspecified
Severity: enhancement