add po support with proselint, writegood, msgfmt and alex

ale_linters/po/alex.vim

@@ -0,0 +1,11 @@
+" Author: Cian Butler https://github.com/butlerx
+" Description: alex for PO files
+
+call ale#linter#Define('po', {
+\   'name': 'alex',
+\   'executable': 'alex',
+\   'command': 'alex %s -t',
+\   'output_stream': 'stderr',
+\   'callback': 'ale#handlers#alex#Handle',
+\   'lint_file': 1,
+\})

ale_linters/po/msgfmt.vim

@@ -0,0 +1,10 @@
+" Author: Cian Butler https://github.com/butlerx
+" Description: msgfmt for PO files
+
+call ale#linter#Define('po', {
+\   'name': 'msgfmt',
+\   'executable': 'msgfmt',
+\   'output_stream': 'stderr',
+\   'command': 'msgfmt --statistics %t',
+\   'callback': 'ale#handlers#unix#HandleAsWarning',
+\})

ale_linters/po/proselint.vim

@@ -0,0 +1,9 @@
+" 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',
+\})

ale_linters/po/write-good.vim

@@ -0,0 +1,9 @@
+" Author: Cian Butler https://github.com/butlerx
+" Description: write-good for PO files
+
+call ale#linter#Define('po', {
+\   'name': 'write-good',
+\   'executable_callback': 'ale#handlers#writegood#GetExecutable',
+\   'command_callback': 'ale#handlers#writegood#GetCommand',
+\   'callback': 'ale#handlers#writegood#Handle',
+\})