Remove hard-coded "Mozilla" from some properties files by rewording. Bug 80838. r=doron, sr=brendan (in his absence) using his magic "dtd/properties changes only" rubberstamp.

mailnews/compose/resources/locale/en-US/composeMsgs.properties

@@ -106,7 +106,7 @@
 12527=THIS IS JUST A PLACEHOLDER.  YOU SHOULD NEVER SEE THIS STRING.
 
 ## @name NS_ERROR_TCP_READ_ERROR
-12528=A network error occurred while Mozilla was was receiving data.  (Network Error: %s)  Try connecting again.
+12528=A network error occurred while receiving data.  (Network Error: %s)  Try connecting again.
 
 ## @name NS_ERROR_COULD_NOT_GET_USERS_MAIL_ADDRESS
 12529=An error occurred sending mail:  the return mail address was invalid.  Please verify that your email address is correct in your Mail preferences and try again.

mailnews/local/resources/locale/en-US/localMsgs.properties

@@ -67,7 +67,7 @@
 # Status - write error occurred
 ## @name POP3_MESSAGE_WRITE_ERROR
 ## @loc None
-4006=Mozilla could not write the email to the mailbox. Make sure the file system allows you write privileges and enough disk space to copy the mailbox.
+4006=Unable to write the email to the mailbox. Make sure the file system allows you write privileges, and you have enough disk space to copy the mailbox.
 
 # Status - connecting to host
 ## @name POP3_CONNECT_HOST_CONTACTED_SENDING_LOGIN_INFORMATION
@@ -137,7 +137,7 @@
 ## @name POP3_ENTER_PASSWORD_PROMPT
 ## @loc None
 # LOCALIZATION NOTE(4016): Do not translate the word "%1$s@%2$s" below.
-# Place the word "%1$s@%2$s" where email account name should appear (i.e. mozilla@mozilla.org)
+# Place the word "%1$s@%2$s" where email account name should appear (i.e. john.smith@example.org)
 4017=Enter your password for %1$s@%2$s.
 
 ## @name POP3_PREVIOUSLY_ENTERED_PASSWORD_IS_INVALID_ETC