Bug 1000956 - Add textbox to the en-US dictionary. r=ehsan

extensions/spellcheck/locales/en-US/hunspell/dictionary-sources/upstream-hunspell.diff

@@ -9614,44 +9614,46 @@
 > testcase/MS
 46831a52679
 > testsuite/MS
-46925a52774
+46845a52694
+> textbox/SM
+46925a52775
 > theremin/MS
-47455c53304
+47455c53305
 < toolbar
 ---
 > toolbar/MS
-47755a53605
+47755a53606
 > transfect/DSMG
-47774a53625,53626
+47774a53626,53627
 > transgenderism
 > transgene/MS
-47951c53803
+47951c53804
 < triage/M
 ---
 > triage/MG
-48869a54722
+48869a54723
 > unlikeable
-49211c55064
+49211c55065
 < vagina/M
 ---
 > vagina/MS
-49368,49369c55221
+49368,49369c55222
 < velour's
 < velours's
 ---
 > velour/MS
-49478a55331
+49478a55332
 > vertices
-50148a56002
+50148a56003
 > weaponize/DSG
-50260,50261d56113
+50260,50261d56114
 < werwolf/M
 < werwolves
-50728c56580
+50728c56581
 < women
 ---
 > women/M
-50794c56646
+50794c56647
 < wop/S!
 ---
 > wop/MS!

extensions/spellcheck/locales/en-US/hunspell/en-US.dic

@@ -1,4 +1,4 @@
-57468
+57469
 0/nm
 0th/pt
 1/n1
@@ -53044,6 +53044,7 @@ tetrahedron/SM
 tetrameter/MS
 text/FMS
 textbook/SM
+textbox/SM
 textile/MS
 textual/FY
 textural/Y