Change method name 'localize' to 'createChannelType'

[pdhung3012]

This class is used to provide default system wide channel types. This method named 'localize' is to create channel type. Thus, the method name 'createChannelType' is more intuitive than 'localize'.

[pdhung3012]

Hello. I already register for the eca agreement.

[5iver]

#6883

https://github.com/openhab/openhab-core