[gtranslator] help: Remove any mention of plugins

[Andre Klapper <aklapper src gnome org>]

commit 5f633e42022c0ce0b138b776106d460b97cc46c2
Author: Andre Klapper <a9016009 gmx de>
Date:   Thu Sep 26 01:30:03 2019 +0200

    help: Remove any mention of plugins
    
    Because there are no plugins anymore.

 help/C/figures/alt-lang.png   | Bin 24128 -> 0 bytes
 help/C/figures/char-map.png   | Bin 11552 -> 0 bytes
 help/C/gtr-plugins.page       |  72 ------------------------------------------
 help/C/gtr-profiles.page      |   1 -
 help/C/gtr-shortcut-keys.page |   1 -
 help/meson.build              |   2 --
 6 files changed, 76 deletions(-)
---
diff --git a/help/C/gtr-profiles.page b/help/C/gtr-profiles.page
index b4ad3c94..5803046a 100644
--- a/help/C/gtr-profiles.page
+++ b/help/C/gtr-profiles.page
@@ -5,7 +5,6 @@
 
   <info>
     <link type="guide" xref="index#gtr-advanced" group="first"/>
-    <link type="seealso" xref="gtr-plugins"/>
     <link type="seealso" xref="gtr-shortcut-keys"/>
 
  <revision pkgversion="2.91.6" date="2013-06-18" status="review"/>
diff --git a/help/C/gtr-shortcut-keys.page b/help/C/gtr-shortcut-keys.page
index dcfb961b..7d42f3dc 100644
--- a/help/C/gtr-shortcut-keys.page
+++ b/help/C/gtr-shortcut-keys.page
@@ -6,7 +6,6 @@
 
   <info>
     <link type="guide" xref="index#gtr-advanced"/>
-    <link type="seealso" xref="gtr-plugins"/>
     <link type="seealso" xref="gtr-profiles"/>
     
  <revision pkgversion="2.91.6" date="2013-06-18" status="review"/>
diff --git a/help/meson.build b/help/meson.build
index 0b0383b9..548e6fea 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -24,8 +24,6 @@ sources = [
 ]
 
 media = [
-  'figures/alt-lang.png',
-  'figures/char-map.png',
   'figures/gtranslator32.png',
   'figures/gtranslator_interface2.png',
   'figures/gtranslator_tm_strings.png',