updated for version 7.3.1144
Problem:    "RO" is not translated everywhere.
Solution:   Put inside _(). (Sergey Alyoshin)
diff --git a/src/buffer.c b/src/buffer.c
index ae744d2..a46e30e 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -3139,7 +3139,7 @@
 #endif
 					? _("[New file]") : "",
 	    (curbuf->b_flags & BF_READERR) ? _("[Read errors]") : "",
-	    curbuf->b_p_ro ? (shortmess(SHM_RO) ? "[RO]"
+	    curbuf->b_p_ro ? (shortmess(SHM_RO) ? _("[RO]")
 						      : _("[readonly]")) : "",
 	    (curbufIsChanged() || (curbuf->b_flags & BF_WRITE_MASK)
 							  || curbuf->b_p_ro) ?
@@ -3976,7 +3976,7 @@
 	case STL_ROFLAG_ALT:
 	    itemisflag = TRUE;
 	    if (wp->w_buffer->b_p_ro)
-		str = (char_u *)((opt == STL_ROFLAG_ALT) ? ",RO" : "[RO]");
+		str = (char_u *)((opt == STL_ROFLAG_ALT) ? ",RO" : _("[RO]"));
 	    break;
 
 	case STL_HELPFLAG: