Fix strange messages for rails g foo

[gfx]

On my environment, rails g foo says:

Could not find generator 'foo'. Maybe you meant 'job'と'task' or 'cell'
Run rails generate --help for more options.

The と is and in Japanese Hiragana, meaning it tries to localize some messages but generates strange messages.

This pull-request fixes this issue by disabling localization by #to_sentence(), showing Maybe you meant 'job', 'task' or 'cell'.

[amatsuda]

Confirmed the fix. Thanks!