Update ion_auth_lang.php

Translated the last part :)
Merge pull request #424 from DjordjeR/patch-1

Update ion_auth_lang.php
Removed duplicate string (index_inactive_link)
Merge pull request #426 from tagawa/language-edits

Removed duplicate string (index_inactive_link)
Added Japanese translation for views
Merge pull request #427 from tagawa/japanese-translation

Added Japanese translation for views
Update ion_auth_model.php

Use of microtime() alone is considered insecure.  
This function is precise to micoseconds.  
An attacker with a botnet of 1,000 bots who synchronizes the clock
with server time to 1 second only needs 1,000 tries per bot.

openssl_random_pseudo_bytes is cryptographically secure as it uses an
OS source (such as /dev/urandom).  The concatenation with microtime and mt_rand
is for legacy support and a second best option.
Update ion_auth_model.php
Merge pull request #428 from 52aa456eef8b60ad6754b31fbdcc77bb/2

2
Missing strings added
Update ion_auth_lang.php
Fixed session native flashdata duplicate sweep
Fixed session native flashdata duplicate sweep
Fixed session native flashdata duplicate sweep
Fixed session native flashdata duplicate sweep
Update auth.php
Update Ion_auth.php
Merge pull request #432 from hannta/2

Missing strings added to Finnish translation
Merge pull request #434 from cweric/2

Fixed session native flashdata duplicate sweep
Croatian language update