bump 4.6.0
Merge pull request #1721 from shackbarth/bump460

bump 4.6.0
Copy en_US translation string to the target: if it's another en_XX language (e.g. en_AU)
Merge pull request #1724 from jmcd73/4_6_x

Copy en_US translation string to the target: if it's another en_XX langu...