Fix/cleanup some UI messages (typos, final points...).

io_import_images_as_planes.py

@@ -728,7 +728,7 @@ class IMPORT_IMAGE_OT_to_plane(Operator, AddObjectHelper):
     # Properties - Material / Shader
     SHADERS = (
         ('DIFFUSE', "Diffuse", "Diffuse Shader"),
-        ('SHADELESS', "Shadeless", "Only visible to camera and reflections."),
+        ('SHADELESS', "Shadeless", "Only visible to camera and reflections"),
         ('EMISSION', "Emit", "Emission Shader"),
     )
     shader: EnumProperty(name="Shader", items=SHADERS, default='DIFFUSE', description="Node shader to use")

ui_translate/update_ui.py

@@ -47,7 +47,7 @@ from bpy.app.translations import pgettext_iface as iface_
 # Data ########################################################################
 
 class I18nUpdateTranslationLanguage(PropertyGroup):
-    """Settings/info about a language."""
+    """Settings/info about a language"""
 
     uid: StringProperty(
         name="Language ID",