update property Null safety

1. baguette
2. i18n
3. I18n
4. update property

I18n class

1. Constructors
2. I18n
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. noSuchMethod
8. toString
9. Operators
10. operator ==
11. Static properties
12. aa
13. archive
14. archives
15. baguette
16. bank_card_expire_empty
17. bank_card_form_cvv
18. bank_card_form_cvv_error
19. bank_card_form_cvv_hints
20. bank_card_form_expire
21. bank_card_form_expire_hints
22. bank_card_form_exprie_error
23. bank_card_form_holder
24. bank_card_form_holder_error
25. bank_card_form_holder_hints
26. bank_card_form_number
27. bank_card_form_number_error
28. bank_card_form_number_hints
29. bank_card_holder_empty
30. bank_card_number_empty
31. camera
32. cancel
33. checkout_security
34. congratulation
35. conversation
36. conversations
37. copy
38. country
39. country_hints
40. currency
41. currency_hints
42. currentLanguage
43. currentLocale
44. disable_from_settings
45. dots
46. enable_from_settings
47. environment
48. error
49. error_already_exists
50. error_camera_unavailable
51. error_crash_error_stack
52. error_invalid_information
53. error_localization_unavailable
54. error_no_connectivity
55. error_operation_cancel
56. error_require_authorization
57. friday
58. friday_short
59. gallery
60. language
61. language_hints
62. leavy
63. localization
64. media_error_load_fail
65. media_error_max_duration
66. media_error_min_duration
67. media_error_unknown_format
68. media_pick_photo
69. media_pick_video
70. media_take_photo
71. media_take_video
72. message
73. message_error
74. message_hints
75. message_write
76. messages
77. messenger
78. microphone
79. mode
80. mode_hints
81. monday
82. monday_short
83. na
84. no
85. not_available
86. notifications
87. now
88. ok
89. oops
90. proficency_fluent
91. proficiency
92. proficiency_advance
93. proficiency_elementary
94. proficiency_hints
95. proficiency_intermediate
96. proficiency_native
97. report
98. restart
99. restart_application_message
100. retry
101. saturday
102. saturday_short
103. save
104. search
105. settings
106. sorry
107. speech
108. storage
109. success
110. sunday
111. sunday_short
112. theme
113. theme_hints
114. thursday
115. thursday_short
116. today
117. tuesday
118. tuesday_short
119. unarchive
120. unknown
121. update
122. update_application_message
123. wednesday
124. wednesday_short
125. yay
126. yes
127. yesterday
128. Static methods
129. load