diff --git a/i18n/api/nl.json b/i18n/api/nl.json
new file mode 100644
index 000000000..0094a6d8d
--- /dev/null
+++ b/i18n/api/nl.json
@@ -0,0 +1,11 @@
+{
+	"@metadata": {
+		"authors": [
+			"McDutchie"
+		]
+	},
+	"apihelp-query+mathwbextracts-example-1": "Vraagt een samenvatting van wiskundige Wikibase-items op.",
+	"apihelp-query+mathwbextracts-summary": "Retourneert een samenvatting van een wiskundig Wikibase-item in HTML.",
+	"apihelp-query+mathwbextracts-param-qid": "De QID van het Wikibase-item dat wordt opgevraagd.",
+	"apihelp-query+mathwbextracts-param-uselang": "De taal die moet worden aangevraagd voor het Wikibase-item. Engels is de standaardwaarde."
+}
diff --git a/i18n/de.json b/i18n/de.json
index b268480f6..c8b404f5b 100644
--- a/i18n/de.json
+++ b/i18n/de.json
@@ -6,7 +6,8 @@
 			"Metalhead64",
 			"Revolus",
 			"Umherirrender",
-			"Justman10000"
+			"Justman10000",
+			"McDutchie"
 		]
 	},
 	"math-desc": "Ergänzt das Tag <code>&lt;math&gt;</code> zum Darstellen mathematischer Formeln",
@@ -22,7 +23,7 @@
 	"math-visualeditor-mwlatexinspector-id": "Linkkennung (optional)",
 	"math-visualeditor-mwlatexinspector-qid": "Wikibase-ID (mit Q-Präfix)",
 	"math-visualeditor-mwmathdialog-title": "Math-Formel",
-	"math-visualeditor-symbol-group-chem-addition": "Zusatzverbindungen",
+	"math-visualeditor-symbol-group-chem-addition": "Additionsverbindungen",
 	"math-visualeditor-symbol-group-chem-aggregation": "Aggregatzustände",
 	"math-visualeditor-symbol-group-chem-arrows": "Reaktionspfeile",
 	"math-visualeditor-symbol-group-chem-brackets": "Runde Klammern, Klammern & geschweifte Klammern",
diff --git a/i18n/nl.json b/i18n/nl.json
index a4239ae2c..3331c2816 100644
--- a/i18n/nl.json
+++ b/i18n/nl.json
@@ -30,13 +30,19 @@
 	"math-visualeditor-mwlatexinspector-id": "Koppelings-ID (optioneel)",
 	"math-visualeditor-mwlatexinspector-qid": "Wikibase-id (voorzien van Q-achtervoegsel)",
 	"math-visualeditor-mwmathdialog-title": "Wiskundige formule",
+	"math-visualeditor-symbol-group-chem-addition": "Additieverbindingen",
+	"math-visualeditor-symbol-group-chem-aggregation": "Aggregatietoestanden",
 	"math-visualeditor-symbol-group-chem-arrows": "Reactiepijlen",
+	"math-visualeditor-symbol-group-chem-brackets": "Haakjes en accolades",
+	"math-visualeditor-symbol-group-chem-charges": "Ladingen",
+	"math-visualeditor-symbol-group-chem-dots": "Ongepaarde elektronen en radicaalpunten",
 	"math-visualeditor-symbol-group-chem-equations": "Scheikundige vergelijking",
 	"math-visualeditor-symbol-group-chem-formulae": "Scheikundige formule",
 	"math-visualeditor-symbol-group-chem-greek": "Griekse tekens",
 	"math-visualeditor-symbol-group-chem-isotopes": "Isotopen",
 	"math-visualeditor-symbol-group-chem-operators": "Vergelijkingsoperatoren",
 	"math-visualeditor-symbol-group-chem-oxidation": "Oxidatietoestanden",
+	"math-visualeditor-symbol-group-chem-precipitate": "Neerslag en gas",
 	"math-visualeditor-symbol-group-chem-stoichiometric": "Stoichiometrische getallen",
 	"math-visualeditor-symbol-group-math-accents": "Accenten en leestekens",
 	"math-visualeditor-symbol-group-math-arrows": "Pijlen",
@@ -74,11 +80,16 @@
 	"math-test-fail": "Test ''$1''  <span style=\"color:red\">mislukt</span>.",
 	"math-test-start": "Uitvoeren backendtests voor de weergavemodus ''$1''.",
 	"math-test-success": "Test \"$1\" <span style=\"color:green\">is geslaagd</span>.",
+	"math-test-contains-diff": "De geretourneerde tekenreeks $1 bevat niet de verwachte tekenreeks $2.",
+	"math-test-equals-diff": "De geretourneerde tekenreeks $1 wijkt af van de verwachte tekenreeks $2.",
 	"math-tracking-category-error": "Pagina's met rekenkundige fouten",
 	"math-tracking-category-error-desc": "Pagina's in deze categorie hebben fouten in het gebruik van math tags.",
+	"math-tracking-category-mhchem-deprecation": "Pagina's die een verouderd formaat van de chem-tags gebruiken",
+	"math-tracking-category-mhchem-deprecation-desc": "De pagina’s in deze categorie gebruiken een verouderde indeling van de chem-tags",
 	"math-tracking-category-texvc-deprecation": "Pagina's die een verouderd wiskundig formaat gebruiken",
 	"math-tracking-category-texvc-deprecation-desc": "Pagina's in deze categorie gebruiken een verouderd wiskundig labelformaat",
 	"math-tracking-category-render-error": "Pagina's met renderfouten in wiskundige formules",
+	"math-tracking-category-render-error-desc": "De pagina’s in deze categorie bevatten weergavefouten in de wiskundetags.",
 	"math_unknown_error": "onbekende fout",
 	"math_unknown_function": "onbekende functie \"$1\"",
 	"mw_math_latexml": "LaTeXML (experimenteel; gebruikt MathML)",
@@ -87,17 +98,24 @@
 	"mw_math_source": "LaTeX-bron (voor tekstbrowsers)",
 	"prefs-math": "Formules",
 	"mathstatus": "Status formuleweergave",
+	"mathwikibase": "Informatie over de wiskundige formule",
 	"datatypes-type-math": "Wiskundige uitdrukking",
 	"wikibase-listdatatypes-math-head": "Wiskundige uitdrukking",
+	"wikibase-listdatatypes-math-body": "Letterlijk gegevensveld voor wiskundige uitdrukkingen, formules, vergelijkingen en dergelijke, uitgedrukt in een variant van LaTeX.",
 	"math-wikibase-header": "Informatie van wiskundige items",
 	"math-wikibase-formula": "Formule",
 	"math-wikibase-formula-name": "Naam",
 	"math-wikibase-formula-type": "Type",
 	"math-wikibase-formula-header-format": "'''$1:''' $2",
 	"math-wikibase-formula-description": "Beschrijving",
+	"math-wikibase-formula-information": "Informatie over de wiskundige formule",
 	"math-wikibase-formula-link-header": "Gegegevensbron",
 	"math-wikibase-formula-elements-header": "Elementen van de formule",
 	"math-wikibase-special-form-header": "Specificeer de naam van de formule",
 	"math-wikibase-special-form-placeholder": "Titel van de formule",
-	"math-wikibase-special-error-header": "Fout"
+	"math-wikibase-special-form-button": "Informatie opvragen",
+	"math-wikibase-special-error-header": "Fout",
+	"math-wikibase-special-error-invalid-argument": "Uw opgegeven Wikibase-item-ID bestaat niet.",
+	"math-wikibase-special-error-unknown": "Er is een onbekende fout opgetreden bij het ophalen van gegevens van Wikibase.",
+	"math-wikibase-special-error-no-wikibase": "Om deze speciale pagina te kunnen gebruiken is de uitbreiding Wikibase vereist."
 }
diff --git a/i18n/qqq.json b/i18n/qqq.json
index b89f2b61f..77318f9bb 100644
--- a/i18n/qqq.json
+++ b/i18n/qqq.json
@@ -30,19 +30,19 @@
 	"math-visualeditor-mwlatexinspector-id": "Label for the link ID attribute of the math node",
 	"math-visualeditor-mwlatexinspector-qid": "Label for the Wikidata ID attribute of the math node",
 	"math-visualeditor-mwmathdialog-title": "Title for the dialog to edit <nowiki><math></nowiki> formula blocks.",
-	"math-visualeditor-symbol-group-chem-addition": "Label for the addition compounds group of chem symbols",
-	"math-visualeditor-symbol-group-chem-aggregation": "Label for the states of aggregation group of chem symbols",
+	"math-visualeditor-symbol-group-chem-addition": "Label for the addition compounds group of chem symbols\n\nSee [[:w:Addition reaction]], [[:w:Chemical compound]]",
+	"math-visualeditor-symbol-group-chem-aggregation": "Label for the states of aggregation group of chem symbols\n\nIn English this is better known as [[:w:State of matter]]",
 	"math-visualeditor-symbol-group-chem-arrows": "Label for the reaction arrows group of chem symbols",
 	"math-visualeditor-symbol-group-chem-brackets": "Label for the parenthesis, brackets & braces group of chem symbols",
-	"math-visualeditor-symbol-group-chem-charges": "Label for the charges group of chem symbols\n{{Identical|Charge}}",
-	"math-visualeditor-symbol-group-chem-dots": "Label for the unpaired electrons & radical dots group of chem symbols",
+	"math-visualeditor-symbol-group-chem-charges": "Label for the charges group of chem symbols\n\nSee [[:w:Electric charge]]\n\n{{Identical|Charge}}",
+	"math-visualeditor-symbol-group-chem-dots": "Label for the unpaired electrons & radical dots group of chem symbols\n\nSee [[:w:Unpaired electron]], [[:w:Radical (chemistry)#Depiction in chemical reactions]]",
 	"math-visualeditor-symbol-group-chem-equations": "Label for the chemical equations group of chem symbols",
 	"math-visualeditor-symbol-group-chem-formulae": "Label for the chemical formulae group of chem symbols",
 	"math-visualeditor-symbol-group-chem-greek": "Label for the greek characters group of chem symbols",
 	"math-visualeditor-symbol-group-chem-isotopes": "Label for the isotopes group of chem symbols",
 	"math-visualeditor-symbol-group-chem-operators": "Label for the equation operators group of chem symbols",
 	"math-visualeditor-symbol-group-chem-oxidation": "Label for the oxidation states group of chem symbols",
-	"math-visualeditor-symbol-group-chem-precipitate": "Label for the precipitate and gas group of chem symbols",
+	"math-visualeditor-symbol-group-chem-precipitate": "Label for the precipitate and gas group of chem symbols\n\nSee [[:w:Precipitation (chemistry)]], [[:w:Gas]]",
 	"math-visualeditor-symbol-group-chem-stoichiometric": "Label for the stoichiometric numbers group of chem symbols",
 	"math-visualeditor-symbol-group-math-accents": "Label for the accents group of math symbols",
 	"math-visualeditor-symbol-group-math-arrows": "Label for the arrows group of math symbols\n{{Identical|Arrow}}",