feat(filter): using majorMinorMappings in the filter

frontend/src/services/FilterService.js

 import { getMostNRecentSemesters } from "../utils/compareSemesters";
 import UniversityService from "./data/UniversityService";
 import CountryService from "./data/CountryService";
+import { getUpdatedMajor, getUpdatedMinor } from "../utils/majorMinorMappings";
 
 /**
  * Class that handle all the filter manipulation with caching
@@ -50,7 +51,7 @@ class FilterService {
     }));
 
     this._destinationOpenCount = universities.filter(
-      u => u.denormalized_infos.is_destination_open === true
+      (u) => u.denormalized_infos.is_destination_open === true
     ).length;
   }
 
@@ -110,20 +111,17 @@ class FilterService {
         allowedSemesters === null ? true : allowedSemesters.includes(sem)
       )
       .map(([, forSemester]) => forSemester)
-      .flatMap(forSemester => Object.entries(forSemester))
+      .flatMap((forSemester) => Object.entries(forSemester))
       .flatMap(([major, minors]) =>
-        minors.map(minor => {
-          if (major === "GSM" || major === "GM") {
-            major = "IM";
-          }
-          return `${major} — ${minor}`;
+        minors.map((minor) => {
+          const maj = getUpdatedMajor(major);
+          const min = getUpdatedMinor(major, minor);
+          return `${maj} — ${min}`;
         })
       );
 
-    const extraMinors = this.getMajorInUniv(univObj).map(major => {
-      if (major === "GSM" || major === "GM") {
-        major = "IM";
-      }
+    const extraMinors = this.getMajorInUniv(univObj).map((major) => {
+      major = getUpdatedMajor(major);
       return `${major} — Toutes filières confondues`;
     });
     return [...new Set(realMinors), ...extraMinors];