Remove unused imports. Explicitly import a few deep imports.

lib/mnemonic.py

@@ -35,7 +35,6 @@ import pbkdf2
 from .util import print_error
 from .bitcoin import is_old_seed, is_new_seed
 from . import version
-from . import i18n
 
 # http://www.asahi-net.or.jp/~ax2s-kmtn/ref/unicode/e_asia.html
 CJK_INTERVALS = [
@@ -164,7 +163,6 @@ class Mnemonic(object):
         return i % custom_entropy == 0
 
     def make_seed(self, seed_type='standard', num_bits=132, custom_entropy=1):
-        from . import version
         prefix = version.seed_prefix(seed_type)
         # increase num_bits in order to obtain a uniform distibution for the last word
         bpw = math.log(len(self.wordlist), 2)