Add Swahili translation for "Excluding {days}" (#736)

- Added a Swahili translation for the phrase "Excluding {days}" in the language translations file.
- Ensured consistent formatting and localization standards are maintained.
- Updated the key `"Excluding {days}"` with its Swahili equivalent `"Ukiondoa {days}"`.

Author: CynthiaWahome

src/translations.php

@@ -425,6 +425,7 @@
         "Week Streak" => "Mfululizo wa wiki",
         "Longest Week Streak" => "Mfululizo mrefu zaidi wa wiki",
         "Present" => "Sasa",
+        "Excluding {days}" => "Ukiondoa {days}",
     ],
     "ta" => [
         "Total Contributions" => "மொத்த\nபங்களிப்புகள்",