[gimp] INSTALL: update gettext requirement.

[Jehan <jehanp src gnome org>]

commit 9c84d2375b35aaada5ef17b98cf125567317721f
Author: Jehan <jehan girinstud io>
Date:   Wed Aug 1 18:57:35 2018 +0200

    INSTALL: update gettext requirement.
    
    Also fix number of hyphens around the title.

 INSTALL.in | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/INSTALL.in b/INSTALL.in
index 0b5b6a6419..28a8f99b97 100644
--- a/INSTALL.in
+++ b/INSTALL.in
@@ -1,6 +1,6 @@
---------------------------------------
+---------------------------------------
 Installation instructions for GIMP @GIMP_APP_VERSION@
---------------------------------------
+---------------------------------------
 
 There are some basic steps to building and installing GIMP.
 
@@ -35,7 +35,7 @@ header files installed.
   2. You need intltool (at least @INTLTOOL_REQUIRED_VERSION@, but preferably a newer version).
      Intltool can be downloaded from
      https://ftp.gnome.org/pub/gnome/sources/intltool/
-     You are recommended to install gettext version @XGETTEXT_RECOMMENDED_VERSION@ or over. Earlier gettext 
had
+     You also need gettext version @XGETTEXT_REQUIRED_VERSION@ or over. Earlier gettext had
      issues with script-fu localization, ending up in incomplete GIMP localization.
 
   3. You need to have GEGL version @GEGL_REQUIRED_VERSION@ or newer and babl version