Fix the displayName of HOC components

[SimeonC]

Updating the HOC components to have displayNames consistent with the react docs definition: https://reactjs.org/docs/higher-order-components.html#convention-wrap-the-display-name-for-easy-debugging
This affects some dev tools like react-cosmos that use this format to detect what the "Original" component name is. Also standard is good.

[coveralls]

Coverage increased (+0.08%) to 93.778% when pulling cfc7073 on SimeonC:fix-HOC-displayName into 61c4645 on i18next:master.

[jamuhl]

I'm not a big fan of adding tons of dependencies...in this case the function is very small -> so please add the function to utils and remove the npm dependency

[SimeonC]

Fair enough, have updated removing the dependency.
I guess this is small enough having multiple versions of the same code in your JS Bundle won't matter so much.

[jamuhl]

published in react-i18next@10.5.3

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