Use sources_non_forked folder for pathogen path, with sources_non_forked_fallback folder as fallback.

sources_non_forked/ale/ale_linters/po/alex.vim

@@ -1,4 +0,0 @@
-" Author: Cian Butler https://github.com/butlerx
-" Description: alex for PO files
-
-call ale#handlers#alex#DefineLinter('po', '--text')

sources_non_forked/ale/ale_linters/po/msgfmt.vim

@@ -1,30 +0,0 @@
-" Author: Cian Butler https://github.com/butlerx
-" Description: msgfmt for PO files
-
-function! ale_linters#po#msgfmt#Handle(buffer, lines) abort
-    let l:results = ale#handlers#unix#HandleAsWarning(a:buffer, a:lines)
-    let l:index = 0
-
-    for l:item in l:results
-        if l:index > 0 && l:item.text =~? 'this is the location of the first definition'
-            let l:last_item = l:results[l:index - 1]
-
-            if l:last_item.text =~? 'duplicate message definition'
-                let l:last_item.text = 'duplicate of message at line ' . l:item.lnum
-                let l:item.text = 'first location of duplicate of message at line ' . l:last_item.lnum
-            endif
-        endif
-
-        let l:index += 1
-    endfor
-
-    return l:results
-endfunction
-
-call ale#linter#Define('po', {
-\   'name': 'msgfmt',
-\   'executable': 'msgfmt',
-\   'output_stream': 'stderr',
-\   'command': 'msgfmt --statistics --output-file=- %t',
-\   'callback': 'ale_linters#po#msgfmt#Handle',
-\})

sources_non_forked/ale/ale_linters/po/proselint.vim

@@ -1,9 +0,0 @@
-" Author: Cian Butler https://github.com/butlerx
-" Description: proselint for PO files
-
-call ale#linter#Define('po', {
-\   'name': 'proselint',
-\   'executable': 'proselint',
-\   'command': 'proselint %t',
-\   'callback': 'ale#handlers#unix#HandleAsWarning',
-\})

sources_non_forked/ale/ale_linters/po/writegood.vim

@@ -1,4 +0,0 @@
-" Author: Cian Butler https://github.com/butlerx
-" Description: write-good for PO files
-
-call ale#handlers#writegood#DefineLinter('po')