Fix technical debt cause by Merge Request Notes refactor
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=21456) </details> <!--IssueSummary end--> While debugging the code added here https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#3ce7f1dd43287a1d04e957283a8f7ff4e3f60ec3_80_93 I found the following problems: 1. `camelCaseKeys` function is duplicated and is not used. This was pointed in the MR, but somehow was merged. Fixed in: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/17667 1. Sprintf with user generated content needs to be escaped: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#e75a068a217e33deac9009c31c835d7b972d2210_67_79 1. Do i18n properly:https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62474836 1. `v-html` shouldn't be used: 1. https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#d63222f7e9a4ec7b560a9e43597e4de7c2e4fffc_0_32 1. https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62474886 1. Identation doesn't follow the styleguide: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#3e9f352f8d1d561f5108008cbec308921f6eb9d5_0_82 1. SVGs should use `icon.vue`: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#a8841151b538089b177018118015a54d494223a3_0_45 1. A span with `type=button` https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#a8841151b538089b177018118015a54d494223a3_0_77 1. a class named `.line-resolved-text`: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#a8841151b538089b177018118015a54d494223a3_0_77 1. button without type: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62474218 1. Unecessay reassignment https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62474165 1. Button without type https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#d7023f611ef2e7cf7310e5813e81acb8bf38ed6f_171_184 1. loading_icon.vue should have been used https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62476132 1. icon.vue should have been used: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62476218 1. no button type https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62476243 1. Unresolved fixme comment: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62476357 1. foreach was used instead of reduce. Decreases performance & readability: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62473611 1. Improve variable naming: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62476577 1. what is this foreach doing? https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#note_62473672 1. component order is not the same as the styleguide: https://gitlab.com/gitlab-org/gitlab-ce/commit/059ab73b8eae3a546d0a19fe99ef0c52df5fac01#5ff60f23cdeb24af173d741ad2c3373aa3b23d35_0_1
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