[reader mode] Shorten 'Show Reading Mode' string to 'Reading Mode'

Previously the string was too long and would get cut off. The solution
proposed was to modify the string.

Screen recording with modification:
http://screencast/cast/NjI5NTQ2NzQzOTY4NTYzMnw2NzFkZDZkNS03Nw

(cherry picked from commit d3e5445c10beed60a0dc2884d2a13490e316330a)

Bug: 429566899
Fixed: 432025468
Change-Id: Iea7f7530a031502257cb848b5ec8365ecb9ba17e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6725534
Reviewed-by: Brandon Wylie <wylieb@google.com>
Commit-Queue: Evan Luo <evanluo@google.com>
Reviewed-by: Brandon Fong <bjfong@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1486448}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6735135
Commit-Queue: Harry Souders <harrysouders@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Harry Souders <harrysouders@google.com>
Cr-Commit-Position: refs/branch-heads/7258@{#1389}
Cr-Branched-From: f600d0656fd5b5fe4a82981f533d31ed6939e2e4-refs/heads/main@{#1477651}
4 files changed
tree: d5cc00c7517c999ee3d87caa8914bf14cf6f91fb
  1. .github/
  2. android_webview/
  3. apps/
  4. ash/
  5. base/
  6. build/
  7. build_overrides/
  8. buildtools/
  9. cc/
  10. chrome/
  11. chromecast/
  12. chromeos/
  13. codelabs/
  14. components/
  15. content/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. gpu/
  25. headless/
  26. infra/
  27. ios/
  28. ipc/
  29. media/
  30. mojo/
  31. native_client_sdk/
  32. net/
  33. pdf/
  34. ppapi/
  35. printing/
  36. remoting/
  37. rlz/
  38. sandbox/
  39. services/
  40. skia/
  41. sql/
  42. storage/
  43. styleguide/
  44. testing/
  45. third_party/
  46. tools/
  47. ui/
  48. url/
  49. webkit/
  50. .clang-format
  51. .clang-tidy
  52. .clangd
  53. .cursorignore
  54. .git-blame-ignore-revs
  55. .gitallowed
  56. .gitattributes
  57. .gitignore
  58. .gitmodules
  59. .gn
  60. .mailmap
  61. .rustfmt.toml
  62. .vpython3
  63. .yapfignore
  64. ATL_OWNERS
  65. AUTHORS
  66. BUILD.gn
  67. CODE_OF_CONDUCT.md
  68. codereview.settings
  69. CPPLINT.cfg
  70. CRYPTO_OWNERS
  71. DEPS
  72. DIR_METADATA
  73. LICENSE
  74. LICENSE.chromium_os
  75. OWNERS
  76. PRESUBMIT.py
  77. PRESUBMIT_test.py
  78. PRESUBMIT_test_mocks.py
  79. README.md
  80. SECURITY_OWNERS
  81. WATCHLISTS
README.md

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