Advice to manipulate specific file

Hello dear vim users.

I am using a file with the following format:

something both french and english
fr: du français

en: something in english

en: also in markdown format

What would be ideal for me is to see this in vim:

French            |     English
--------------------------------------------------------------
du français      |    something in english
                      |    also in markdown format

I am close to this using fold. But I have two problems.

The first is to hide the "en: " or "fr: " part in each line while keeping the right syntax highlighting. I hacked a bit the syntax highlighting format for markdown.

The second is I don't know how to hide single line with fold. Up until there here is my code:

" multilanguage folders
autocmd BufEnter *.md setlocal foldmethod=expr
" se lance avec execute FrenchView()
fun! FrenchView()
    %g/^en: .*$\n^en: /foldclose
    %g/^fr: .*$\n^fr: /foldopen
    " setlocal foldexpr=getline(v:lnum)=~'^en:\ '?1:0
endfun
" se lance avec execute EnglishView()
fun! EnglishView()
    %g/^fr: .*$\n^fr: /foldclose
    %g/^en: .*$\n^en: /foldopen
    " setlocal foldexpr=getline(v:lnum)=~'^fr:\ '?1:0
endfun
fun! MyFoldLevel(lnum)
    if getline(a:lnum)=~'^fr:\ '
        if getline(a:lnum+1)=~'^fr:\ '
            return '1'
        else
            return '<1'
        endif
    else
        if getline(a:lnum)=~'^en:\ '
            if getline(a:lnum+1)=~'^en:\ '
                return '1'
            else
                return '<1'
            endif
        else
            return 0
        endif
    endif
endfun
" use with execute MultiView()
fun! MultiView()
    setlocal foldexpr=MyFoldLevel(v:lnum)
endfun
:command FR execute FrenchView()
:command EN execute EnglishView()
:command MM execute MultiView()
autocmd BufEnter *.md execute MultiView()

autocmd BufEnter *latest.md set scrollbind
autocmd BufEnter *latest.md execute FrenchView()
autocmd BufEnter *latest.md vsplit
autocmd BufEnter *latest.md execute EnglishView()

May my complete method is wrong. Furthermore I would like to have the ability to make  "language block".
How would you do it?

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