Add new languages to platform

[NPavie]

The following languages are needed for future collaboration on IPIP content elaboration

• Swedish
• Finish

[NPavie]

Actions required in CoreBundle :

• Add locales codes (sv and fi) to backend LocaleManager
• (optionnal) Add flags in bundles/clarolinecore/images/locale-icons.svg

Actions required in AppBundle:

• Add swedish and finnish flags in resources
• Add locales selection in administration pannel

• Prepare UI translation google sheet to include the new codes (include codes display translations)

  Estimated time, including tests : 0.5 day

[NPavie]

2 columns added in the UI fields translation sheet.

Text associated with the code for the language selection inputs pf the platform can be found on lines

• 1908 for Finnish "fi" locale code
• 2861 for Swedish "sv" locale code

[NPavie]

New languages have been added to sidpt main branch. Translations will be handled on the long run. Closing this issue.