Updated Register Text to Login Text

[baekusboo]

Fixes #555

Describe the changes you've made

Changed the Register text to Login text as discussed in the issue.

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

NA

Checklist

• [x] I have mentioned related issue number in PR description.
• [ ] I have added screenshots and related demo links of my changes..
• [x] The title of my pull request is a short description of the requested changes.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] Open Source Program names(OPTIONAL: If you participated in any open-source program then please mention the program name here) hacktoberfest 2022