Bug 32775: Correctly display language order in sysprefs when you have multiple langua...

Bug 32775: Correctly display language order in sysprefs when you have multiple languages in a group

Test plan:
1. Apply first patch
2. Install en-NZ and another language - e.g. mi-NZ - so you have three
languages showing in your sysprefs en-NZ (selected), en (unselected) and
mi-NZ (selected)
3. Tick en-NZ and mi-NZ in language and OPACLanguages sysprefs. Order
en-NZ above mi-NZ and save
4. Refresh the syspref page and confirm mi-NZ is displaying above en-NZ,
even though you ordered en-NZ first
5. Refresh the syspref page multiple times and observe the order of the
languages changes
6. Apply this (second) patch
7. Restart plack
8. Refresh syspref page several times confirming that en-NZ is always
ordered first - as expected.

Sponsored-by: Kinder library, New Zealand
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>