chore: fix misleading Imagick error message

Author: michalsn

system/Language/en/Images.php

@@ -21,7 +21,7 @@
     'pngNotSupported'        => 'PNG images are not supported.',
     'webpNotSupported'       => 'WEBP images are not supported.',
     'fileNotSupported'       => 'The supplied file is not a supported image type.',
-    'unsupportedImageCreate' => 'Your server does not support the GD function required to process this type of image.',
+    'unsupportedImageCreate' => 'Your server does not support the required functionality to process this type of image.',
     'jpgOrPngRequired'       => 'The image resize protocol specified in your preferences only works with JPEG or PNG image types.',
     'rotateUnsupported'      => 'Image rotation does not appear to be supported by your server.',
     'imageProcessFailed'     => 'Image processing failed. Please verify that your server supports the chosen protocol and that the path to your image library is correct.',

user_guide_src/source/changelogs/v4.7.1.rst

@@ -18,6 +18,8 @@ BREAKING
 Message Changes
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+- Updated ``Images.unsupportedImageCreate``.
+
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 Changes
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