Removing duplicate fluent username/password nodes

[ellieplayswow]

changes tl;dr

• for some reason, debugging cosmic-settings would occasionally cause it to crash due to a duplicate username and password keys in fluent
• duplicates have been removed
• in the case of french, the 2 usernames had different translations, so i went with the one that seemed to make most contextual sense (apologies in advance if wrong)

error i got:

/home/user/RustroverProjects/s76/cosmic-settings/target/debug/cosmic-settings
  ERROR  Error while adding resource to bundle: Overriding { kind: Message, id: "username" }.
    at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/i18n-embed-0.15.3/src/fluent.rs:35 on main

  ERROR  Error while adding resource to bundle: Overriding { kind: Message, id: "password" }.
    at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/i18n-embed-0.15.3/src/fluent.rs:35 on main

  ERROR  Error while adding resource to bundle: Overriding { kind: Message, id: "username" }.
    at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/i18n-embed-0.15.3/src/fluent.rs:35 on main

  ERROR  Error while adding resource to bundle: Overriding { kind: Message, id: "password" }.
    at /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/i18n-embed-0.15.3/src/fluent.rs:35 on main