Update setup.iss

@Lakritzator 

Update Inno Setup script
Add to default language name the prefix "en." to enhance for English base language
Add "ShowFile" string to use in Icon description" like "Show Readme.txt" and "Show License.txt" (now is only "Readme.txt" and "License.txt"
Add translation for "ShowFile" string

Greenshot/releases/innosetup/setup.iss

@@ -190,8 +190,8 @@ Root: HKLM; Subkey: Software\Classes\Greenshot\shell\open\command; ValueType: st
 [Icons]
 Name: {group}\{#ExeName}; Filename: {app}\{#ExeName}.exe; WorkingDir: {app}; AppUserModelID: "{#ExeName}"
 Name: {group}\{cm:UninstallIconDescription} {#ExeName}; Filename: {uninstallexe}; WorkingDir: {app};
-Name: {group}\Readme.txt; Filename: {app}\readme.txt; WorkingDir: {app}
-Name: {group}\License.txt; Filename: {app}\license.txt; WorkingDir: {app}
+Name: {group}\{cm:ShowFile} Readme.txt; Filename: {app}\readme.txt; WorkingDir: {app}
+Name: {group}\{cm:ShowFile} License.txt; Filename: {app}\license.txt; WorkingDir: {app}
 
 [Languages]
 Name: en; MessagesFile: compiler:Default.isl
@@ -214,42 +214,42 @@ Name: startup; Description: {cm:startup}
 
 [CustomMessages]
 ;Language names in the original language
-dexfranconia=Frängisch (Deutsch)
-arSY=العربية
-caCA=Català
-csCZ=Ceština
-daDK=Dansk
-elGR=ελληνικά
-esES=Español
-etEE=Eesti
-faIR=پارسی
-fiFI=Suomi
-frFR=Français
-frQC=Français - Québec
-heIL=עִבְרִית
-huHU=Magyar
-idID=Bahasa Indonesia
-itIT=Italiano
-jaJP=日本語
-kabDZ=Taqbaylit
-koKR=한국어
-ltLT=Lietuvių
-lvLV=Latviski
-nnNO=Nynorsk
-plPL=Polski
-ptBR=Português do Brasil
-ptPT=Português de Portugal
-roRO=Română
-ruRU=Pусский
-skSK=Slovenčina
-slSI=Slovenščina
-srRS=Српски
-svSE=Svenska
-trTR=Türk
-ukUA=Українська
-viVN=Việt
-zhCN=简体中文
-zhTW=繁體中文
+en.dexfranconia=Frängisch (Deutsch)
+en.arSY=العربية
+en.caCA=Català
+en.csCZ=Ceština
+en.daDK=Dansk
+en.elGR=ελληνικά
+en.esES=Español
+en.etEE=Eesti
+en.faIR=پارسی
+en.fiFI=Suomi
+en.frFR=Français
+en.frQC=Français - Québec
+en.heIL=עִבְרִית
+en.huHU=Magyar
+en.idID=Bahasa Indonesia
+en.itIT=Italiano
+en.jaJP=日本語
+en.kabDZ=Taqbaylit
+en.koKR=한국어
+en.ltLT=Lietuvių
+en.lvLV=Latviski
+en.nnNO=Nynorsk
+en.plPL=Polski
+en.ptBR=Português do Brasil
+en.ptPT=Português de Portugal
+en.roRO=Română
+en.ruRU=Pусский
+en.skSK=Slovenčina
+en.slSI=Slovenščina
+en.srRS=Српски
+en.svSE=Svenska
+en.trTR=Türk
+en.ukUA=Українська
+en.viVN=Việt
+en.zhCN=简体中文
+en.zhTW=繁體中文
 
 en.box=Box plug-in
 en.confluence=Confluence plug-in
@@ -269,6 +269,7 @@ en.startgreenshot=Start {#ExeName}
 en.startup=Start {#ExeName} with Windows start
 en.win10=Windows 10 plug-in
 en.UninstallIconDescription=Uninstall
+en.ShowFile=Show
 
 de.confluence=Confluence Plug-in
 de.default=Standard installation
@@ -339,6 +340,8 @@ it.startgreenshot=Esegui {#ExeName}
 it.startup=Esegui {#ExeName} all''avvio di Windows
 it.win10=Plugin Windows 10
 it.UninstallIconDescription=Disinstalla
+it.ShowFile=Visualizza
+
 it.dexfranconia=Fräncofono (Tedesco)
 it.arSY=Arabo (Siria)
 it.caCA=Catalano