Updated runtime files.

Add Serbian translations and spell checking.
diff --git a/runtime/doc/editing.txt b/runtime/doc/editing.txt
index 4ade4aa..dc50455 100644
--- a/runtime/doc/editing.txt
+++ b/runtime/doc/editing.txt
@@ -1,4 +1,4 @@
-*editing.txt*   For Vim version 8.0.  Last change: 2017 Nov 16
+*editing.txt*   For Vim version 8.0.  Last change: 2018 Feb 19
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1202,7 +1202,8 @@
 :wqa[ll]! [++opt]
 :xa[ll]!	Write all changed buffers, even the ones that are readonly,
 		and exit Vim.  If there are buffers without a file name or
-		which cannot be written for another reason, Vim will not quit.
+		which cannot be written for another reason, or there is a
+		terminal with a running job, Vim will not quit.
 		{not in Vi}
 
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