Add missinglong_press entry for trigger_type in strings.json for Hue (home-assistant#154437)

Author: mvdwetering

homeassistant/components/hue/strings.json

@@ -68,6 +68,7 @@
       "initial_press": "\"{subtype}\" pressed initially",
       "repeat": "\"{subtype}\" held down",
       "short_release": "\"{subtype}\" released after short press",
+      "long_press": "\"{subtype}\" long pressed",
       "long_release": "[%key:component::hue::device_automation::trigger_type::remote_button_long_release%]",
       "double_short_release": "[%key:component::hue::device_automation::trigger_type::remote_double_button_short_press%]",
       "start": "[%key:component::hue::device_automation::trigger_type::initial_press%]"