Update Hebrew language code to he per IANA registry (#401)
* Update Hebrew language code to he per IANA registry
Per [IANA registry](https://www.iana.org/assignments/language-subtag-registry/language-subtag-registry), `iw` was deprecated as the code for Hebrew in 1989 and the preferred code is `he`
The correct subtag:
```
%%
Type: language
Subtag: he
Description: Hebrew
Added: 2005-10-16
Suppress-Script: Hebr
%%
```
And the deprecation
```
%%
Type: language
Subtag: iw
Description: Hebrew
Added: 2005-10-16
Deprecated: 1989-01-01
Preferred-Value: he
Suppress-Script: Hebr
%%
```
* Update hebrew ISO code to he
Per discussion, it's ok to make this change without backwards compatibility
altryne