Corrected some very minor grammar mistakes.

app/widgets/ContactData/locales.ini

@@ -1,5 +1,5 @@
 [general]
-legend              = General Informations
+legend              = General Information
 name                = Name
 nickname            = Nickname
 date_of_birth       = Date of Birth
@@ -27,7 +27,7 @@ title               = Listening
 title               = Last seen
 
 [client]
-title               = Client Informations
+title               = Client Information
 
 [explore]
 last_registered     = Last registered
@@ -58,4 +58,4 @@ from_button         = Ask to subscribe
 from_text           = But this contact can still see if you are online
 nil                 = No subscriptions
 nil_button          = Invite
-nil_text            = This contact is in your contact list but there is no subscriptions between the two accounts
+nil_text            = This contact is in your contact list but there is no subscription between the two accounts