patch 8.2.1128: the write message mentions characters, but it's bytes

Problem:    The write message mentions characters, but it's actually bytes.
Solution:   Change "C" to "B" and "characters" to "bytes".
diff --git a/src/testdir/dumps/Test_diff_syntax_1.dump b/src/testdir/dumps/Test_diff_syntax_1.dump
index 05598ff..9204b47 100644
--- a/src/testdir/dumps/Test_diff_syntax_1.dump
+++ b/src/testdir/dumps/Test_diff_syntax_1.dump
@@ -17,4 +17,4 @@
 |~| @73
 |~| @73
 |X+1#0000000&|p|r|o|g|r|a|m|1|.|c| @45|1|,|1| @11|A|l@1
-|"+0&&|X|p|r|o|g|r|a|m|2|.|c|"| |5|L|,| |7|6|C| @53
+|"+0&&|X|p|r|o|g|r|a|m|2|.|c|"| |5|L|,| |7|6|B| @53
diff --git a/src/testdir/dumps/Test_display_unprintable_01.dump b/src/testdir/dumps/Test_display_unprintable_01.dump
index e4cc0d9..552b402 100644
--- a/src/testdir/dumps/Test_display_unprintable_01.dump
+++ b/src/testdir/dumps/Test_display_unprintable_01.dump
@@ -6,4 +6,4 @@
 |t|w|o| @46
 |~+0#4040ff13&| @48
 |X+1#0000000&|u|n|i|x|.|t|x|t| @22|1|,|1| @11|A|l@1
-|"+0&&|X|m|a|c|.|t|x|t|"| |[|n|o|e|o|l|]|[|m|a|c|]| |2|L|,| |9|C| @19
+|"+0&&|X|m|a|c|.|t|x|t|"| |[|n|o|e|o|l|]|[|m|a|c|]| |2|L|,| |9|B| @19
diff --git a/src/testdir/dumps/Test_long_file_name_1.dump b/src/testdir/dumps/Test_long_file_name_1.dump
index 46fa9bd..1dcafc3 100644
--- a/src/testdir/dumps/Test_long_file_name_1.dump
+++ b/src/testdir/dumps/Test_long_file_name_1.dump
@@ -5,4 +5,4 @@
 |~| @73
 |~| @73
 |~| @73
-|<+0#0000000&|x@64|"| |0|L|,| |0|C| 
+|<+0#0000000&|x@64|"| |0|L|,| |0|B| 
diff --git a/src/testdir/dumps/Test_tselect_1.dump b/src/testdir/dumps/Test_tselect_1.dump
index cdaee45..9090122 100644
--- a/src/testdir/dumps/Test_tselect_1.dump
+++ b/src/testdir/dumps/Test_tselect_1.dump
@@ -7,4 +7,4 @@
 |~| @48
 |~| @48
 |~| @48
-|"+0#0000000&|X|t|e|s|t|.|c|"| |2|L|,| |2|3|C| @14|1|,|1| @10|A|l@1| 
+|"+0#0000000&|X|t|e|s|t|.|c|"| |2|L|,| |2|3|B| @14|1|,|1| @10|A|l@1| 
diff --git a/src/testdir/test_cscope.vim b/src/testdir/test_cscope.vim
index a1a839f..9d12e2f 100644
--- a/src/testdir/test_cscope.vim
+++ b/src/testdir/test_cscope.vim
@@ -103,7 +103,7 @@
     for cmd in ['cs find f Xmemfile_test.c', 'cs find 7 Xmemfile_test.c']
       enew
       let a = execute(cmd)
-      call assert_true(a =~ '"Xmemfile_test.c" \d\+L, \d\+C')
+      call assert_true(a =~ '"Xmemfile_test.c" \d\+L, \d\+B')
       call assert_equal('Xmemfile_test.c', @%)
     endfor
 
@@ -113,7 +113,7 @@
       let a = execute(cmd)
       let alines = split(a, '\n', 1)
       call assert_equal('', alines[0])
-      call assert_true(alines[1] =~ '"Xmemfile_test.c" \d\+L, \d\+C')
+      call assert_true(alines[1] =~ '"Xmemfile_test.c" \d\+L, \d\+B')
       call assert_equal('(1 of 1): <<global>> #include <assert.h>', alines[2])
       call assert_equal('#include <assert.h>', getline('.'))
     endfor
diff --git a/src/testdir/test_netbeans.vim b/src/testdir/test_netbeans.vim
index 52c3782..8a35389 100644
--- a/src/testdir/test_netbeans.vim
+++ b/src/testdir/test_netbeans.vim
@@ -501,7 +501,7 @@
   let l = readfile('Xnetbeans')
   call assert_equal('send: 3:insertDone!78 T F', l[-1])
   sleep 1m
-  call assert_match('.*/Xfile4" 3L, 0C', v:statusmsg)
+  call assert_match('.*/Xfile4" 3L, 0B', v:statusmsg)
   let g:last += 3
 
   " saveDone test
@@ -511,7 +511,7 @@
   let l = readfile('Xnetbeans')
   call assert_equal('send: 3:saveDone!79', l[-1])
   sleep 1m
-  call assert_match('.*/Xfile4" 3L, 0C', v:statusmsg)
+  call assert_match('.*/Xfile4" 3L, 0B', v:statusmsg)
   let g:last += 3
 
   " unimplemented command test