fixed error of array length in 3 plces and fixed i18n test (#184)

nice work @Chubik .  cleaner to boot.  Thank you.

server/i18n_test.go

@@ -50,7 +50,9 @@ func TestTranslationsPreInit(t *testing.T) {
 		p.API = api
 		err = p.TranslationsPreInit()
 		require.True(t, err.Error() == "unable to read i18n directory: readdirent: invalid argument" ||
-			err.Error() == "unable to read i18n directory: readdirent: not a directory")
+			err.Error() == "unable to read i18n directory: readdirent: not a directory" ||
+			err.Error() == "unable to read i18n directory: fdopendir: not a directory")
+
 	})
 
 	t.Run("no i18n files", func(t *testing.T) {

server/occurrence.go

@@ -886,6 +886,9 @@ func (p *Plugin) onEN(when string, user *model.User) (times []time.Time, err err
 	dateSplit := p.regSplit(dateUnit, "T|Z")
 	dateSplit = p.regSplit(dateSplit[0], "-")
 	timeSplit := p.regSplit(timeUnit, ":")
+	if len(dateSplit) < 3 || len(timeSplit) < 3 {
+		return []time.Time{}, errors.New("error date/time format")
+	}
 	year, _ := strconv.Atoi(dateSplit[0])
 	month, _ := strconv.Atoi(dateSplit[1])
 	day, _ := strconv.Atoi(dateSplit[2])
@@ -1059,6 +1062,9 @@ func (p *Plugin) everyEN(when string, user *model.User) (times []time.Time, err
 			dateSplit := p.regSplit(dateUnit, "T|Z")
 			dateSplit = p.regSplit(dateSplit[0], "-")
 			timeSplit := p.regSplit(timeUnit, ":")
+			if len(dateSplit) < 3 || len(timeSplit) < 3 {
+				return []time.Time{}, errors.New("error date/time format")
+			}
 			year, _ := strconv.Atoi(dateSplit[0])
 			month, _ := strconv.Atoi(dateSplit[1])
 			day, _ := strconv.Atoi(dateSplit[2])

server/parse.go

@@ -603,54 +603,14 @@ func (p *Plugin) normalizeDate(text string, user *model.User) (string, error) {
 			return "", errors.New("unrecognized date format")
 		}
 
-		switch parts[0] {
-		case T("jan"),
-			T("january"):
-			parts[0] = "01"
-			break
-		case T("feb"),
-			T("february"):
-			parts[0] = "02"
-			break
-		case T("mar"),
-			T("march"):
-			parts[0] = "03"
-			break
-		case T("apr"),
-			T("april"):
-			parts[0] = "04"
-			break
-		case T("may"):
-			parts[0] = "05"
-			break
-		case T("june"):
-			parts[0] = "06"
-			break
-		case T("july"):
-			parts[0] = "07"
-			break
-		case T("aug"),
-			T("august"):
-			parts[0] = "08"
-			break
-		case T("sept"),
-			T("september"):
-			parts[0] = "09"
-			break
-		case T("oct"),
-			T("october"):
-			parts[0] = "10"
-			break
-		case T("nov"),
-			T("november"):
-			parts[0] = "11"
-			break
-		case T("dec"),
-			T("december"):
-			parts[0] = "12"
-			break
-		default:
-			return "", errors.New("month not found")
+		var err error
+		parts[0], err = p.monthNumber(parts[0], user)
+		if err != nil {
+			return "", err
+		}
+
+		if len(parts) < 3 {
+			return "", errors.New("unrecognized date format")
 		}
 
 		mon, mErr := strconv.Atoi(parts[0])
@@ -903,6 +863,49 @@ func (p *Plugin) daySuffix(user *model.User, day string) string {
 	return day
 }
 
+func (p *Plugin) monthNumber(month string, user *model.User) (string, error) {
+
+	T, _ := p.translation(user)
+
+	switch month {
+	case T("jan"),
+		T("january"):
+		return "01", nil
+	case T("feb"),
+		T("february"):
+		return "02", nil
+	case T("mar"),
+		T("march"):
+		return "03", nil
+	case T("apr"),
+		T("april"):
+		return "04", nil
+	case T("may"):
+		return "05", nil
+	case T("june"):
+		return "06", nil
+	case T("july"):
+		return "07", nil
+	case T("aug"),
+		T("august"):
+		return "08", nil
+	case T("sept"),
+		T("september"):
+		return "09", nil
+	case T("oct"),
+		T("october"):
+		return "10", nil
+	case T("nov"),
+		T("november"):
+		return "11", nil
+	case T("dec"),
+		T("december"):
+		return "12", nil
+	default:
+		return "", errors.New("month not found")
+	}
+}
+
 func (p *Plugin) weekDayNumber(day string, user *model.User) int {
 
 	T, _ := p.translation(user)