Added Italian translation for HelpTextNote. Also tweaked the notice about prefixes.

Files/Languages/Setup/Default.iss

@@ -1,13 +1,13 @@
 ; *** Inno Setup version 5.7.0+ English installer messages ***
 ;
+; IMPORTANT: Before translating this text, make sure to prefix all messages
+; with your language's internal name followed by a period. See Italian.iss
+; for an example.
+;
 ; Note: When translating this text, do not add periods (.) to the end of
 ; messages that didn't have them already, because on those messages Inno
 ; Setup adds the periods automatically (appending a period would result in
 ; two periods being displayed).
-;
-; Also note: Before translating this text, make sure to prefix all messages
-; with your language's internal name followed by a period. See Italian.iss
-; for an example.
 
 [Messages]
 HelpTextNote=/PORTABLE=1%nEnable portable mode.

Files/Languages/Setup/Italian.iss

@@ -1,19 +1,22 @@
 ; *** Inno Setup version 5.7.0+ Italian installer messages ***
 ;
+; IMPORTANT: Before translating this text, make sure to prefix all messages
+; with your language's internal name followed by a period. See Italian.iss
+; for an example.
+;
 ; Note: When translating this text, do not add periods (.) to the end of
 ; messages that didn't have them already, because on those messages Inno
 ; Setup adds the periods automatically (appending a period would result in
 ; two periods being displayed).
 ;
-; Also note: Before translating this text, make sure to prefix all messages
-; with your language's internal name followed by a period. See Italian.iss
-; for an example.
-;
-; Italian.isl - Last Update: 19.06.2018  by bovirus ([email protected])
+; Italian.isl - Last Update: 03.07.2018  by bovirus ([email protected])
 ;
 ; Translator name:   bovirus
 ; Translator e-mail: [email protected]
 
+[Messages]
+italian.HelpTextNote=/PORTABLE=1%nAbilita modo portatile.
+
 [CustomMessages]
 italian.ISPPTitle=Inno Setup Preprocessor
 italian.ISPPSubtitle=Vuoi installare Inno Setup Preprocessor?