Fix three spelling errors

Discovered while performing translation:

'attempting' was misspelled in the two files patched here
'Network' was misspelled once

'en' PO file is also updated.
The update in PO file also includes the string update in commit 4609c7a9c.

Change-Id: I4d0eed02db74b152db4f599361f7df3e599ef5c6