Patch 8.1.0510
Problem:    Filter test fails when $LANG is C.UTF-8.
Solution:   Set 'helplang' to "en" for any C language. (Christian Brabandt,
            closes #3577)
Files:      src/option.c


*** ../vim-8.1.0509/src/option.c        2018-10-25 13:31:33.829906902 +0200
--- src/option.c        2018-11-04 14:34:39.233665491 +0100
***************
*** 4256,4267 ****
            p_hlg = empty_option;
        else
        {
!           /* zh_CN becomes "cn", zh_TW becomes "tw". */
            if (STRNICMP(p_hlg, "zh_", 3) == 0 && STRLEN(p_hlg) >= 5)
            {
                p_hlg[0] = TOLOWER_ASC(p_hlg[3]);
                p_hlg[1] = TOLOWER_ASC(p_hlg[4]);
            }
            p_hlg[2] = NUL;
        }
        options[idx].flags |= P_ALLOCED;
--- 4256,4273 ----
            p_hlg = empty_option;
        else
        {
!           // zh_CN becomes "cn", zh_TW becomes "tw"
            if (STRNICMP(p_hlg, "zh_", 3) == 0 && STRLEN(p_hlg) >= 5)
            {
                p_hlg[0] = TOLOWER_ASC(p_hlg[3]);
                p_hlg[1] = TOLOWER_ASC(p_hlg[4]);
            }
+           // any C like setting, such as C.UTF-8, becomes "en"
+           else if (STRLEN(p_hlg) >= 1 && *p_hlg == 'C')
+           {
+               p_hlg[0] = 'e';
+               p_hlg[1] = 'n';
+           }
            p_hlg[2] = NUL;
        }
        options[idx].flags |= P_ALLOCED;
*** ../vim-8.1.0509/src/version.c       2018-11-03 21:47:10.949346136 +0100
--- src/version.c       2018-11-04 14:40:33.523200579 +0100
***************
*** 794,795 ****
--- 794,797 ----
  {   /* Add new patch number below this line */
+ /**/
+     510,
  /**/

-- 
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