patch 8.0.1778: script to check translations does not always work

Problem:    Script to check translations does not always work.
Solution:   Go to first line before searching for MIME.
diff --git a/src/po/check.vim b/src/po/check.vim
index a1ec623..9cfa36a 100644
--- a/src/po/check.vim
+++ b/src/po/check.vim
@@ -121,6 +121,7 @@
 
 " Check that the \n at the end of the msgid line is also present in the msgstr
 " line.  Skip over the header.
+1
 /^"MIME-Version:
 while 1
   let lnum = search('^msgid\>')
diff --git a/src/version.c b/src/version.c
index d6be02f..9b65751 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1778,
+/**/
     1777,
 /**/
     1776,