remove unknown tag copy

assets/l10n/intl_en.arb

@@ -4265,12 +4265,9 @@
   "grammarCopyAccNom": "Accusative, Nominative",
   "grammarCopyObl": "Oblique Case",
   "grammarCopyAct": "Active",
-  "grammarCopyTense_unknown": "Tense Unknown",
   "grammarCopyBrck": "Bracket",
-  "grammarCopyAspect_unknown": "Aspect Unknown",
   "grammarCopyArt": "Article",
   "grammarCopySing": "Singular",
-  "grammarCopyMood_unknown": "Mood Unknown",
   "grammarCopyMasc": "Masculine",
   "grammarCopyMod": "Modal",
   "grammarCopyAdverbial": "Adverbial",
@@ -4286,7 +4283,6 @@
   "grammarCopyCnd": "Conditional",
   "grammarCopyIntRel": "Interrogative, Relative",
   "grammarCopyAcc": "Accusative",
-  "grammarCopyVoice_unknown": "Voice Unknown",
   "grammarCopyPartTag": "Partitive",
   "grammarCopyInt": "Interrogative",
   "grammarCopyPast": "Past",
@@ -4298,10 +4294,8 @@
   "grammarCopyInterrogative": "Interrogative",
   "grammarCopyInfm": "Informal",
   "grammarCopyTim": "Time",
-  "grammarCopyPerson_unknown": "Person Unknown",
   "grammarCopyNeg": "Negative",
   "grammarCopyTot": "Total",
-  "grammarCopyCase_unknown": "Case Unknown",
   "grammarCopyAdnomial": "Adnominal",
   "grammarCopyProg": "Progressive",
   "grammarCopySub": "Subjunctive",
@@ -4316,13 +4310,11 @@
   "grammarCopyDem": "Demonstrative",
   "grammarCopyPre": "Preposition",
   "grammarCopyFin": "Finite",
-  "grammarCopyGender_unknown": "Gender Unknown",
   "grammarCopyPos": "Positive",
   "grammarCopyQuot": "Quotation",
   "grammarCopyGer": "Gerund",
   "grammarCopyPass": "Passive",
   "grammarCopyGen": "Genitive",
-  "grammarCopyNumber_unknown": "Number Unknown",
   "grammarCopyPrs": "Present",
   "grammarCopyDef": "Definite",
   "grammarCopyOrd": "Ordinal",
@@ -4336,7 +4328,6 @@
   "grammarCopyExcl": "Exclamative",
   "grammarCopy1": "First Person",
   "grammarCopyIni": "Initial",
-  "grammarCopyForm_unknown": "Form Unknown",
   "grammarCopyPerson": "Person",
   "grammarCopyForeign": "Foreign",
   "grammarCopyVoice": "Voice",