pt.js - Added missing strings
pt.js - Added missing strings

It seems I forgot to update Portuguese. The script (now at https://github.com/jzu/new_mew_strings) also brought up leftovers in ar and zhtw.

ADD_Label_8
ADD_MetaMask
ADD_Radio_5_PathAlternative
ADD_Radio_5_PathCustom
ADD_Radio_5_PathTrezor
ADD_Radio_5_withTrezor
ADD_Radio_5_woTrezor
ERROR_36
ERROR_37
SWAP_elapsed
VIEWWALLET_HidePrivKey
VIEWWALLET_ShowPrivKey
x_MetaMask
mcdee/etherwallet,mcdee/etherwallet,kvhnuke/etherwallet,ubiq/pyruswallet,kvhnuke/etherwallet,ubiq/pyruswallet,ubiq/pyruswallet,mcdee/etherwallet