Change 'filename:' for Python 2 (legacy)

Before renaming, all Python 2 filenames were 'learnpython-*.py'.

This commit renames them to 'learnpythonlegacy-*.py'.

To verify that the filenames were named consistently across
translations prior to this commit, and to change this:

```
find . -name "pythonlegacy*.markdown" -exec ack filename: {} \;

find . -name "pythonlegacy*.markdown" -exec \
  sed -i 's/^filename: learnpython/filename: learnpythonlegacy/' {} \;
```

1 files changed, 1 insertions, 1 deletions

diff --git a/de-de/pythonlegacy-de.html.markdown b/de-de/pythonlegacy-de.html.markdown
index 3f8f9783..d66a8551 100644
--- a/de-de/pythonlegacy-de.html.markdown
+++ b/de-de/pythonlegacy-de.html.markdown
@@ -4,7 +4,7 @@ contributors:
     - ["Louie Dinh", "http://ldinh.ca"]
 translators:
     - ["kultprok", "http:/www.kulturproktologie.de"]
-filename: learnpython-de.py
+filename: learnpythonlegacy-de.py
 lang: de-de
 ---