impr(language): move british spellings from language files to british english mode (@AnnaBuchholz) (#6157)

### Description

I changed the British spellings from the english_25k.json file. I then
also deleted a few duplicates. I also added the missing spellings to the
british_english.json file.

### Checks

- [ ] Adding quotes?
- [ ] Make sure to include translations for the quotes in the
description (or another comment) so we can verify their content.
- [ ] Adding a language or a theme?
- [ ] If is a language, did you edit `_list.json`, `_groups.json` and
add `languages.json`?
  - [ ] If is a theme, did you add the theme.css?
- Also please add a screenshot of the theme, it would be extra awesome
if you do so!
- [ ] Check if any open issues are related to this PR; if so, be sure to
tag them below.
- [x] Make sure the PR title follows the Conventional Commits standard.
(https://www.conventionalcommits.org for more info)
- [x] Make sure to include your GitHub username prefixed with @ inside
parentheses at the end of the PR title.

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impr(language): move british spellings to british english mode
(@AnnaBuchholz)

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frontend/static/languages/britishenglish.json

@@ -187,6 +187,9 @@
   ["neighbor", "neighbour"],
   ["neighbors", "neighbours"],
   ["neighboring", "neighbouring"],
+  ["neighborly", "neighbourly"],
+  ["neighborhood", "neighbourhood"],
+  ["neighborhoods", "neighbourhoods"],
   ["magnetizer", "magnetiser"],
   ["appetizer", "appetiser"],
   ["hebraizing", "hebraising"],
@@ -258,6 +261,7 @@
   ["tendinitis", "tendonitis"],
   ["crystallization", "crystallisation"],
   ["humor", "humour"],
+  ["humorous", "humourous"],
   ["chanty", "shanty"],
   ["dyspnea", "dyspnoea"],
   ["aging", "ageing"],
@@ -486,6 +490,7 @@
   ["fraternization", "fraternisation"],
   ["odorless", "odourless"],
   ["odor", "odour"],
+  ["odorous", "odourous"],
   ["rationalization", "rationalisation"],
   ["pretense", "pretence"],
   ["louver", "louvre"],
@@ -539,7 +544,9 @@
   ["enrollment", "enrolment"],
   ["flavor", "flavour"],
   ["flavors", "flavours"],
+  ["flavoring", "flavouring"],
   ["harbor", "harbour"],
+  ["harbored", "harboured"],
   ["honor", "honour"],
   ["honors", "honours"],
   ["labor", "labour"],
@@ -547,7 +554,6 @@
   ["licenses", "licences"],
   ["licensing", "licencing"],
   ["modeling", "modelling"],
-  ["neighborhood", "neighbourhood"],
   ["optimization", "optimisation"],
   ["organization", "organisation"],
   ["organizations", "organisations"],
@@ -568,7 +574,6 @@
   ["authorized", "authorised"],
   ["utilization", "utilisation"],
   ["behaviors", "behaviours"],
-  ["neighborhoods", "neighbourhoods"],
   ["traveled", "travelled"],
   ["utilizing", "utilising"],
   ["utilized", "utilised"],

frontend/static/languages/english_25k.json

@@ -1203,7 +1203,7 @@
     "townships",
     "standoffish",
     "dirigible",
-    "neighbourly",
+    "neighborly",
     "doter",
     "acari",
     "gyve",
@@ -1537,7 +1537,7 @@
     "gunmen",
     "throwed",
     "softy",
-    "belabour",
+    "belabor",
     "moghul",
     "unveil",
     "erudition",
@@ -2142,7 +2142,7 @@
     "ouster",
     "severalty",
     "infelicitous",
-    "flavours",
+    "flavors",
     "dualistic",
     "levee",
     "foment",
@@ -4838,7 +4838,6 @@
     "yuri",
     "netscape",
     "remiges",
-    "neighboured",
     "headway",
     "garnered",
     "uptown",
@@ -5656,7 +5655,7 @@
     "novelization",
     "sett",
     "liquefy",
-    "odourous",
+    "odorous",
     "conditional",
     "lede",
     "cube",
@@ -6213,7 +6212,6 @@
     "liquidus",
     "doormen",
     "addict",
-    "odorous",
     "stumble",
     "copal",
     "google",
@@ -7417,7 +7415,7 @@
     "sled",
     "dilatory",
     "modulation",
-    "harboured",
+    "harbored",
     "Kabbalah",
     "adviser",
     "indicts",
@@ -7562,7 +7560,6 @@
     "clips",
     "colporteur",
     "animosity",
-    "armoury",
     "athanor",
     "ninja",
     "petrous",
@@ -8716,7 +8713,6 @@
     "algol",
     "catharsis",
     "titania",
-    "enamoured",
     "unnecessarily",
     "surreptitious",
     "butty",
@@ -8974,7 +8970,6 @@
     "ursine",
     "watercolor",
     "tarpon",
-    "favourably",
     "auricle",
     "snarky",
     "suet",
@@ -11901,7 +11896,7 @@
     "regimenting",
     "trave",
     "fluster",
-    "flavouring",
+    "flavoring",
     "flawed",
     "jackrabbit",
     "ukelele",
@@ -11980,7 +11975,7 @@
     "graceless",
     "didactic",
     "dived",
-    "dolour",
+    "dolor",
     "upburst",
     "rubescent",
     "posh",
@@ -12211,7 +12206,7 @@
     "outclass",
     "flagellation",
     "abjure",
-    "savoury",
+    "savory",
     "corporeal",
     "producer",
     "appropriateness",
@@ -14065,7 +14060,7 @@
     "neurasthenia",
     "drugget",
     "lidded",
-    "savour",
+    "savor",
     "podium",
     "argentina",
     "astuteness",
@@ -15822,7 +15817,7 @@
     "prescribe",
     "hiccough",
     "photography",
-    "fervour",
+    "fervor",
     "dilapidation",
     "dolente",
     "appetence",
@@ -16327,7 +16322,6 @@
     "inflexion",
     "brine",
     "localization",
-    "rigour",
     "swede",
     "transire",
     "remora",
@@ -16575,7 +16569,6 @@
     "polder",
     "implicitly",
     "becalm",
-    "odourless",
     "whirr",
     "dwarfish",
     "excrescence",
@@ -16600,7 +16593,6 @@
     "kite",
     "hasp",
     "lovingkindness",
-    "labourer",
     "sunbeam",
     "phantasmagoric",
     "owlet",
@@ -16816,7 +16808,6 @@
     "photogenic",
     "allotment",
     "schema",
-    "rancour",
     "venomously",
     "granary",
     "circuitry",
@@ -17211,7 +17202,6 @@
     "sideburns",
     "brats",
     "circumcision",
-    "belabor",
     "swart",
     "comitatus",
     "scroll",
@@ -19123,7 +19113,6 @@
     "thwack",
     "scraped",
     "obtrude",
-    "candour",
     "octavo",
     "feuilleton",
     "domesticity",
@@ -19920,7 +19909,6 @@
     "sorcerer",
     "sycomores",
     "bandy",
-    "favouritism",
     "handicapper",
     "mushing",
     "refutable",
@@ -19998,7 +19986,6 @@
     "heady",
     "transversal",
     "wenlock",
-    "fervor",
     "takings",
     "cryptography",
     "abut",
@@ -21153,7 +21140,6 @@
     "routinely",
     "hobo",
     "alienate",
-    "giaour",
     "cardiac",
     "shebang",
     "islamitic",
@@ -21176,7 +21162,6 @@
     "miasmata",
     "flickers",
     "typesetter",
-    "savor",
     "niger",
     "pristine",
     "blotch",
@@ -21558,7 +21543,6 @@
     "defamatory",
     "spree",
     "animus",
-    "unfavourable",
     "semiotic",
     "resell",
     "spitsbergen",
@@ -21952,7 +21936,6 @@
     "procurer",
     "kalamazoo",
     "scavenger",
-    "dolor",
     "wombat",
     "admonish",
     "hornswoggle",
@@ -22308,7 +22291,6 @@
     "entities",
     "wigwam",
     "giggle",
-    "armourer",
     "induration",
     "elan",
     "burger",
@@ -23093,7 +23075,7 @@
     "pulley",
     "wormhole",
     "circa",
-    "humourous",
+    "humorous",
     "heptane",
     "ides",
     "heteropathy",
@@ -23571,7 +23553,6 @@
     "Nubia",
     "adduction",
     "alderman",
-    "savory",
     "docent",
     "tilter",
     "lasagne",