here is an example of an item ive made
look at the very bottom
<item id="1502" name="koolAid"><!--DEV-->
<property name="IsDeveloper" value="true"/>
<property name="CustomIcon" value="bottledWater"/>
<property name="CustomIconTint" value="F9D054"/>
<property name="Meshfile" value="Items/Food/bottled_waterPrefab"/>
<property name="Material" value="glass"/>
<property name="HoldType" value="3"/>
<property name="Stacknumber" value="10"/>
<property name="Weight" value="10"/>
<property name="EconomicValue" value="30"/>
<property name="CraftingIngredientTime" value="15"/>
<property class="Action1">
<property name="Class" value="Eat"/>
<property name="Delay" value="1"/>
<property name="Use_time" value="..."/>
<property name="Gain_health" value="0"/>
<property name="Gain_stamina" value="0"/>
<property name="Gain_food" value="100"/>
<property name="Gain_water" value="100"/>
<property name="Sound_start" value="UseActions/player_drinking"/>
<property name="Create_item" value="emptyJar"/>
</property>
<property name="Group" value="Food/Cooking"/>
<property name="DescriptionKey" value="koolAidDesc"/> <--koolAidDesc is what you need or whatever your item is with 'Desc' added
</item>
then in the localization file
koolAid,items,Food,,(DEV) Kool Aid,,,, <-- item label
koolAidDesc,items,Food,,Kool Aid... the super juice of liquid meal replacements.\nRestores 100% Food & Water,,,, <-- description that you will see
hope this helps ...BTW try not to use commas in your description as the localizition file uses those as placemark/seperators for the different keys and it will mess up the final results that you see on screen and if you need a new line use (( \n )) like I have above
I know , I know... you's be laughin' at my KoolAid but hey. I grew up drinkin' the stuff and needed a refreshing 'pick me up' for those long builds in creative