Fix a few typos

One of these fixes was already committed in Blender's repo, from
blender/blender-addons@9331ce7.

addons/io_scene_gltf2/__init__.py

@@ -365,13 +365,13 @@ def __init__(self):
     export_unused_textures: BoolProperty(
         name='Prepare Unused textures',
         description=(
-            'Export image texture nodes not assigned to any material.'
-            'This feature is not standard, need an external extension to be included in the glTF file'
+            'Export image texture nodes not assigned to any material. '
+            'This feature is not standard and needs an external extension to be included in the glTF file'
         ),
         default=False)
 
     export_colors: BoolProperty(
-        name='dummy',
+        name='Dummy',
         description='Keep for compatibility only',
         default=True
     )
@@ -535,7 +535,7 @@ def __init__(self):
     export_armature_object_remove: BoolProperty(
         name='Remove Armature Object',
         description=(
-            'Remove Armature object if possible.'
+            'Remove Armature object if possible. '
             'If Armature has multiple root bones, object will not be removed'
             ),
         default=False
@@ -759,8 +759,8 @@ def __init__(self):
         default=False)
 
     export_hierarchy_full_collections: BoolProperty(
-        name='Full Collection hierarchy',
-        description='Export full hierarchy, including inbetween collection',
+        name='Full Collection Hierarchy',
+        description='Export full hierarchy, including intermediate collections',
         default=False
     )
 

addons/io_scene_gltf2/blender/com/gltf2_blender_ui.py

@@ -599,7 +599,7 @@ def draw(self, context):
             row = col.column(align=True)
             row.operator("scene.gltf2_action_filter_refresh", icon="FILE_REFRESH", text="")
         else:
-            row.label(text="No Actions is .blend file")
+            row.label(text="No Actions in .blend file")
 
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