Add support for Right to Left languages

[mrjones-plip]

Describe the issue
Currently CHT Core assumes all languages are left to right (English, French, etc.).

Describe the improvement you'd like
Support languages that are right to left (RTL) like Arabic

[mrjones-plip]

Related forum post

[andrablaj]

@garethbowen I copied your notes from this document to keep track of your first findings publicly.

Glossary

RTL: Right To Left
RHS: Right Hand Side
LHS: Left Hand Side

General text

Google translate was used to check that the character sets are supported, and manually added dir="rtl" to the HTML to test the right alignment.

Navigation

The new "material" navigation coming soon will feature a drawer sliding out from the LHS.

Layout of the large screen app

The app currently shows the list on the LHS and the detail on the RHS.

Form navigation

Buttons are right aligned.

Filters

Filters are on the RHS

Dates

Calendars and dates are in the Gregorian calendar.

[andrablaj]

Additionally, Arabic translations were merged via #9683 and should be available in 4.16.

[andrablaj]

Notes after talking with @latin-panda:

• Ensure RTL works for both old and new designs.
• If we decide to support RTL only for the new design (> 4.12), ensure the old design is not broken by the RTL implementation.

[dianabarsan]

I've made some progress on this in a branch: #9727

Calendars and report filters still need updates.