Bug 22770: Fix typo in German language description of el

Bug 22770: Fix typo in German language description of el

Fixes:
Griechisch (Moern [1453- ] ==> Griechisch (Modern 1453-)

To test:
- Install de-DE language and activate it
- Check the language pull down on advanced search has the typo
- Apply patch and run database update
- Check advanced search again
- Verify the description now shows correctly

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit eba980b3519263856c725cd42d4ff151d7822205)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>