Add partial Arabic translation. Updates #1532.

aegisub/packages/win_installer/fragment_translations.iss

@@ -37,6 +37,8 @@
 
 [Files]
 ; localization (commented out ones are out of date; some don't have wxstd.mo)
+Source: src\mo\ar.mo;          DestDir: {app}\locale\ar;    DestName: aegisub.mo; Flags: ignoreversion
+Source: src\mo\wxstd-ar.mo;    DestDir: {app}\locale\ar;    DestName: wxstd.mo;   Flags: ignoreversion
 Source: src\mo\ca.mo;          DestDir: {app}\locale\ca;    DestName: aegisub.mo; Flags: ignoreversion
 Source: src\mo\wxstd-ca.mo;    DestDir: {app}\locale\ca;    DestName: wxstd.mo;   Flags: ignoreversion
 Source: src\mo\cs.mo;          DestDir: {app}\locale\cs;    DestName: aegisub.mo; Flags: ignoreversion

aegisub/po/Makefile

@@ -3,6 +3,7 @@ include ../Makefile.inc
 .SUFFIXES: .po .mo
 
 PO = \
+	ar.po \
 	ca.po \
 	cs.po \
 	da.po \