Feat(manual) localised versions

Description

Add support for displaying localised versions fo the picsa manual within the manual tool This will now detect the language selected and display the appropriate picsa manual (where available).

In cases where the manual has yet to be downloaded a short prompt will be shown to support downloading the appropriate version

Additionally 2 sections have been added to the contents to make it easier to locate introduction and activity flow charts, and all links updated to open correct page in chichewa versions

Main Changes

Additional Changes

Fix bug where some back buttons would redirect to home page on android
Fix bug where back button would not work correctly with query parameters on android
Add support for rendering downloaded resources directly within app (previously only open external)
Update translations

Discussion

Feedback discussion points if relevant (should also tag as Feedback Discussion)

Preview

Link to app preview if relevant

Screenshots / Videos

Users prompted to download chichewa version of manual within tool

After download manual available with additional sections

e-picsa / picsa-apps