[LyX/master] lyx2lyx: Fix revert_new_languages

[Juergen Spitzmueller]

commit 8bfe3d71986d207c27b1a73b8d8d15e2648e820c
Author: Juergen Spitzmueller <sp...@lyx.org>
Date:   Sat Aug 31 11:20:10 2019 +0200

    lyx2lyx: Fix revert_new_languages
---
 lib/lyx2lyx/lyx_2_4.py |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/lyx2lyx/lyx_2_4.py b/lib/lyx2lyx/lyx_2_4.py
index 1f9924a..5b1a87c 100644
--- a/lib/lyx2lyx/lyx_2_4.py
+++ b/lib/lyx2lyx/lyx_2_4.py
@@ -1882,8 +1882,9 @@ def revert_new_languages(document):
         i = find_token(document.body, "\\lang", i+1)
         if i == -1:
             break
-        if document.body[i][6:].strip() in new_languages:
-            used_languages.add(document.language)
+        val = get_value(document.body, "\\lang", i)
+        if val in new_languages:
+            used_languages.add(val)
 
     # Korean is already supported via CJK, so leave as-is for Babel
     if ("korean" in used_languages
@@ -1893,7 +1894,7 @@ def revert_new_languages(document):
     used_languages.discard("korean")
 
     for lang in used_languages:
-        revert(lang, *new_languages[lang])
+        revert_language(document, lang, new_languages[lang][0], 
new_languages[lang][1])
 
 
 gloss_inset_def = [