[5.0] Error Pages language (#41934)

Added a note to the strings in the installation language file that is used for building the error page.

As seen in the screenshot several language packs have translated instead of localised the string or as in the case of German does not include the country part of the code resulting in unclear options

@tecpromotion

Author: brianteeman

installation/language/en-GB/joomla.ini

@@ -6,28 +6,28 @@
 ; Fatal error page
 ; These will be processed by the JavaScript Build
 BUILD_FATAL_HEADER="Sorry, there was a problem we could not recover from."
-BUILD_FATAL_LANGUAGE="English GB"
+BUILD_FATAL_LANGUAGE="English GB"; IMPORTANT NOTE FOR TRANSLATORS: Do not literally translate this line, instead add the localised name of the language. For example French will be Français FR
 BUILD_FATAL_TEXT="The server returned a \"{{statusCode_statusText}}\""
 BUILD_FATAL_URL_TEXT="Help me resolve this"
 
 ; Build incomplete error page
 ; These will be processed by the JavaScript Build
 BUILD_INCOMPLETE_HEADER="Environment Setup Incomplete"
-BUILD_INCOMPLETE_LANGUAGE="English GB"
+BUILD_INCOMPLETE_LANGUAGE="English GB"; IMPORTANT NOTE FOR TRANSLATORS: Do not literally translate this line, instead add the localised name of the language. For example French will be Français FR
 BUILD_INCOMPLETE_TEXT="It looks like you are trying to run Joomla! from our git repository. To do so requires you to complete a couple of extra steps first."
 BUILD_INCOMPLETE_URL_TEXT="More Details"
 
 ; No XML PHP error page
 ; These will be processed by the JavaScript Build
 BUILD_NOXML_HEADER="Sorry, your PHP is missing a vital library"
-BUILD_NOXML_LANGUAGE="English GB"
+BUILD_NOXML_LANGUAGE="English GB"; IMPORTANT NOTE FOR TRANSLATORS: Do not literally translate this line, instead add the localised name of the language. For example French will be Français FR
 BUILD_NOXML_TEXT="Your host needs to use PHP with support for the XML library to run this version of Joomla!"
 BUILD_NOXML_URL_TEXT="Help me resolve this"
 
 ; Minimum PHP error page
 ; These will be processed by the JavaScript Build
 BUILD_MIN_PHP_ERROR_HEADER="Sorry, your PHP version is not supported."
-BUILD_MIN_PHP_ERROR_LANGUAGE="English GB"
+BUILD_MIN_PHP_ERROR_LANGUAGE="English GB"; IMPORTANT NOTE FOR TRANSLATORS: Do not literally translate this line, instead add the localised name of the language. For example French will be Français FR
 BUILD_MIN_PHP_ERROR_TEXT="Your host needs to use PHP version {{phpversion}} or newer to run this version of Joomla."
 BUILD_MIN_PHP_ERROR_URL_TEXT="Help me resolve this"