@@ -, +, @@ 
---
 misc/translator/LangInstaller.pm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/misc/translator/LangInstaller.pm	
+++ a/misc/translator/LangInstaller.pm	
@@ -455,9 +455,10 @@ sub install_messages {
     make_path($modir);
     system "$self->{msgfmt} -o $mofile $pofile";
 
-    my $tmp_po = sprintf '/tmp/%s-messages.po', $self->{lang};
+    my $tmp_po      = sprintf '/tmp/%s-messages.po', $self->{lang};
     my $po2json_cmd = sprintf '%s %s %s', $self->{po2json}, $js_pofile, $tmp_po;
-    `$po2json_cmd`;
+    $po2json_cmd .= q{ 2> >(grep -v -e 'DEP0128' -e 'trace-deprecation' - )};    # Remove deprecation warning
+    `/usr/bin/bash -c "$po2json_cmd"`;    # We need bash instead of sh (sh: 1: Syntax error: redirection unexpected)
     my $json = read_file($tmp_po);
 
     my $js_locale_data = sprintf 'var json_locale_data = {"Koha":%s};', $json;
--